طبقه اجتماعی (کلاس اجتماعی) نوعی قشربندی است ک در آن قشرها به وسیله مقررات قانونی یا مذهبی ایجاد نمیشوند و عضویت بر مبنای موقعیت موروثی نیست. همچنین طبقه اجتماعی؛ گروهبندی وسیعی از افراد است که دارای منابع اقتصادی مشترکی هستند. نظامهای طبقاتی انعطافپذیرترین نظامهای قشربندی هستند. هیچگونه محدودیتهای رسمی دربارهٔ ازدواج میان گروهی بین افراد متعلق به طبقات مختلف وجود ندارد.
طبقه یک فرد تا اندازهای اکتسابی است؛ نه این که صرفاً در هنگام تولد منسوب گردد. تحرک اجتماعی؛ حرکت صعودی یا نزولی در ساخت طبقاتی؛ بسیار معمولتر از انواع دیگر است. طبقات به تفاوتهای اقتصادی میان گروهبندیهای افراد و نابرابری در تملک و کنترل منابع مادی بستگی دارند. نظامهای طبقاتی اساساً از طریق ارتباطات گسترده غیرشخصی عمل میکنند. پایههای اصلی اختلافات طبقاتی؛ تفاوت در ثروت و شغل است. ثروتمندان، تاجران، کارفرمایان، صاحبان صنایع و مدیران اجرایی؛ معمولاً در طبقه بالا قرار دارند. کارمندان و کارکنان متخصص حرفهای؛ طبقه متوسط را تشکیل میدهند. طبقه کارگر معمولاً در کارهای دستی و مشاغل زراعتی و باربری اشتغال دارند. در بعضی جوامع فئودالی روابط بین طبقات؛ رابطه بهرهکشی است.
بهطور کلی جامعه شناسان سه طبقهٔ اجتماعی را مشخص میکنند:
مزایای اجتماعی یا امتیاز اجتماعی در اصطلاح دانش جامعهشناسی، ویژگی باارزش کمیابی است که دستیابی به آنها با محرومیت نسبی دیگران همراه باشد. ثروت، قدرت و احترام از مهمترین مزایای اجتماعی بهشمار میآیند. مزایای اجتماعی به صورت نابرابر تقسیم میشوند تا ایفای نقش سادهتر شود. سهم فرد از مزایای اجتماعی با فعالیت، آموزش، اشتغال و عضویت در تشکلهای مدنی یا ازدواج افزایش مییابد.
مزیت رفاهی نوعی از مزیت اجتماعی است که همه باید حق داشتن ان را داشته باشند ولی بعضیها به سختی و بعضی به صورت خیلی آسان از ان بهرهمند هستند به عنوان مثال کودکان و نوجوانان حق این را دارند که به مدرسه بروند و دانش بیاموزند.
A social class is a set of concepts in the social sciences and political theory centered on models of social stratification in which people are grouped into a set of hierarchical social categories, the most common being the upper, middle and lower classes.
"Class" is a subject of analysis for sociologists, political scientists, anthropologists and social historians. However, there is not a consensus on a definition of "class" and the term has a wide range of sometimes conflicting meanings. Some people argue that due to social mobility, class boundaries do not exist. In common parlance, the term "social class" is usually synonymous with "socio-economic class", defined as "people having the same social, economic, cultural, political or educational status", e.g., "the working class"; "an emerging professional class". However, academics distinguish social class and socioeconomic status, with the former referring to one's relatively stable sociocultural background and the latter referring to one's current social and economic situation and consequently being more changeable over time.
The precise measurements of what determines social class in society have varied over time. Karl Marx thought "class" was defined by one's relationship to the means of production (their relations of production). His simple understanding of classes in modern capitalist society is the proletariat, those who work but do not own the means of production; and the bourgeoisie, those who invest and live off the surplus generated by the proletariat's operation of the means of production. This contrasts with the view of the sociologist Max Weber, who argued "class" is determined by economic position, in contrast to "social status" or "Stand" which is determined by social prestige rather than simply just relations of production. The term "class" is etymologically derived from the Latin classis, which was used by census takers to categorize citizens by wealth in order to determine military service obligations.
In the late 18th century, the term "class" began to replace classifications such as estates, rank and orders as the primary means of organizing society into hierarchical divisions. This corresponded to a general decrease in significance ascribed to hereditary characteristics and increase in the significance of wealth and income as indicators of position in the social hierarchy.
Historically, social class and behavior were laid down in law. For example, permitted mode of dress in some times and places was strictly regulated, with sumptuous dressing only for the high ranks of society and aristocracy, whereas sumptuary laws stipulated the dress and jewelry appropriate for a person's social rank and station. In Europe, these laws became increasingly commonplace during the Middle Ages. However, these laws were prone to change due to societal changes, and in many cases, these distinctions may either almost disappear, such as the distinction between a patrician and a plebeian being almost erased during the late Roman Republic.
Jean-Jacques Rousseau had a large influence over political ideals of the French Revolution because of his views of inequality and classes. Rousseau saw humans as "naturally pure and good," meaning that humans from birth were seen as innocent and any evilness was learned. He believed that social problems arise through the development of society and suppressing the innate pureness of humankind. He also believed that private property is the main reason for social issues in society because private property creates inequality through the property's value. Even though his theory predicted if there were no private property then there would be wide spread equality, Rousseau accepted that there will always be social inequality because of how society is viewed and run. 
Later Enlightenment thinkers viewed inequality as valuable and crucial to society's development and prosperity. They also acknowledged that private property will ultimately cause inequality because specific resources that are privately owned can be stored and the owners profit off of the deficit of the resource. This can create competition between the classes that was seen as necessary by these thinkers.  This also creates stratification between the classes keeping a distinct difference between lower, poorer classes and the higher, wealthier classes.
Definitions of social classes reflect a number of sociological perspectives, informed by anthropology, economics, psychology and sociology. The major perspectives historically have been Marxism and structural functionalism. The common stratum model of class divides society into a simple hierarchy of working class, middle class and upper class. Within academia, two broad schools of definitions emerge: those aligned with 20th-century sociological stratum models of class society and those aligned with the 19th-century historical materialist economic models of the Marxists and anarchists.
Another distinction can be drawn between analytical concepts of social class, such as the Marxist and Weberian traditions, as well as the more empirical traditions such as socioeconomic status approach, which notes the correlation of income, education and wealth with social outcomes without necessarily implying a particular theory of social structure.
"[Classes are] large groups of people differing from each other by the place they occupy in a historically determined system of social production, by their relation (in most cases fixed and formulated in law) to the means of production, by their role in the social organization of labor, and, consequently, by the dimensions of the share of social wealth of which they dispose and the mode of acquiring it."
For Marx, class is a combination of objective and subjective factors. Objectively, a class shares a common relationship to the means of production. Subjectively, the members will necessarily have some perception ("class consciousness") of their similarity and common interest. Class consciousness is not simply an awareness of one's own class interest but is also a set of shared views regarding how society should be organized legally, culturally, socially and politically. These class relations are reproduced through time.
In Marxist theory, the class structure of the capitalist mode of production is characterized by the conflict between two main classes: the bourgeoisie, the capitalists who own the means of production and the much larger proletariat (or "working class") who must sell their own labour power (wage labour). This is the fundamental economic structure of work and property, a state of inequality that is normalized and reproduced through cultural ideology.
For Marxists, every person in the process of production has separate social relationships and issues. Along with this, every person is placed into different groups that have similar interests and values that can differ drastically from group to group. Class is special in that does not relate to specifically to a singular person, but to a specific role. 
Marxists explain the history of "civilized" societies in terms of a war of classes between those who control production and those who produce the goods or services in society. In the Marxist view of capitalism, this is a conflict between capitalists (bourgeoisie) and wage-workers (the proletariat). For Marxists, class antagonism is rooted in the situation that control over social production necessarily entails control over the class which produces goods—in capitalism this is the exploitation of workers by the bourgeoisie.
Furthermore, "in countries where modern civilisation has become fully developed, a new class of petty bourgeois has been formed". "An industrial army of workmen, under the command of a capitalist, requires, like a real army, officers (managers) and sergeants (foremen, over-lookers) who, while the work is being done, command in the name of the capitalist".
Marx makes the argument that, as the bourgeoisie reach a point of wealth accumulation, they hold enough power as the dominant class to shape political institutions and society according to their own interests. Marx then goes on to claim that the non-elite class, owing to their large numbers, have the power to overthrow the elite and create an equal society.
In The Communist Manifesto, Marx himself argued that it was the goal of the proletariat itself to displace the capitalist system with socialism, changing the social relationships underpinning the class system and then developing into a future communist society in which: "the free development of each is the condition for the free development of all". This would mark the beginning of a classless society in which human needs rather than profit would be motive for production. In a society with democratic control and production for use, there would be no class, no state and no need for financial and banking institutions and money.
These theorists have taken this binary class system and expanded it to include contradictory class locations, the idea that a person can be employed in many different class locations that fall between the two classes of proletariat and bourgeoisie. Erik Olin Wright stated that class definitions are more diverse and elaborate through identifying with multiple classes, having familial ties with people in different a class, or having a temporary leadership role. 
Max Weber formulated a three-component theory of stratification that saw social class as emerging from an interplay between "class", "status" and "power". Weber believed that class position was determined by a person's relationship to the means of production, while status or "Stand" emerged from estimations of honor or prestige.
Weber views class as a group of people who have common goals and opportunities that are available to them. This means that what separates each class from each other is their value in the marketplace through their own goods and services. This creates a divide between the classes through the assets that they have such as property and expertise. 
Weber derived many of his key concepts on social stratification by examining the social structure of many countries. He noted that contrary to Marx's theories, stratification was based on more than simply ownership of capital. Weber pointed out that some members of the aristocracy lack economic wealth yet might nevertheless have political power. Likewise in Europe, many wealthy Jewish families lacked prestige and honor because they were considered members of a "pariah group".
Great British Class Survey
On April 2, 2013, the results of a survey conducted by BBC Lab UK developed in collaboration with academic experts and slated to be published in the journal Sociology were published online. The results released were based on a survey of 160,000 residents of the United Kingdom most of whom lived in England and described themselves as "white". Class was defined and measured according to the amount and kind of economic, cultural and social resources reported. Economic capital was defined as income and assets; cultural capital as amount and type of cultural interests and activities; and social capital as the quantity and social status of their friends, family and personal and business contacts. This theoretical framework was developed by Pierre Bourdieu who first published his theory of social distinction in 1979.
Common Three-Stratum Model
Today, concepts of social class often assume three general categories: a very wealthy and powerful upper class that owns and controls the means of production; a middle class of professional workers, small business owners and low-level managers; and a lower class, who rely on low-paying wage jobs for their livelihood and often experience poverty.
The upper class is the social class composed of those who are rich, well-born, powerful, or a combination of those. They usually wield the greatest political power. In some countries, wealth alone is sufficient to allow entry into the upper class. In others, only people who are born or marry into certain aristocratic bloodlines are considered members of the upper class and those who gain great wealth through commercial activity are looked down upon by the aristocracy as nouveau riche. In the United Kingdom, for example, the upper classes are the aristocracy and royalty, with wealth playing a less important role in class status. Many aristocratic peerages or titles have seats attached to them, with the holder of the title (e.g. Earl of Bristol) and his family being the custodians of the house, but not the owners. Many of these require high expenditures, so wealth is typically needed. Many aristocratic peerages and their homes are parts of estates, owned and run by the title holder with moneys generated by the land, rents or other sources of wealth. However, in the United States where there is no aristocracy or royalty, the upper class status belongs to the extremely wealthy, the so-called "super-rich", though there is some tendency even in the United States for those with old family wealth to look down on those who have earned their money in business, the struggle between new money and old money.
The upper class is the group of people located at the top of the socioeconomic chart. They are the highest you can be. Most of the time, the upper class is seen as the class who doesn’t have to work. This is a myth. Most people in the upper class continue to work and increase their wealth. Although they have many luxuries, they live with a safety net of money. The upper class generally has a big influence on the world and nations economy. In the United States, they are considered ‘the top one-percent”.
The upper class is generally contained within the richest one or two percent of the population. Members of the upper class are often born into it and are distinguished by immense wealth which is passed from generation to generation in the form of estates. Based on some new social and political theories upper class consists of the most wealthy decile group in society which holds nearly 87% of the whole society's wealth.
The middle class is the most contested of the three categories, the broad group of people in contemporary society who fall socio-economically between the lower and upper classes. One example of the contest of this term is that in the United States "middle class" is applied very broadly and includes people who would elsewhere be considered working class. Middle-class workers are sometimes called "white-collar workers".
Theorists such as Ralf Dahrendorf have noted the tendency toward an enlarged middle class in modern Western societies, particularly in relation to the necessity of an educated work force in technological economies. Perspectives concerning globalization and neocolonialism, such as dependency theory, suggest this is due to the shift of low-level labour to developing nations and the Third World.
Middle class is the group of people with typical-everyday jobs that pay significantly more than the poverty line. Examples of these types of jobs are factory workers, salesperson, teacher, cooks and nurses. Typically, the middle class has white-collar jobs as opposed to hands-on jobs. Those with higher skills are rewarded with higher paying jobs or raises, while workers with lower level skills are not paid as much or simply not hired. There is a new trend by some scholars which assumes that the size of the middle class in every society is the same. For example in paradox of interest theory, middle class are those who are in 6th-9th decile groups which hold nearly 12% of the whole society's wealth.
Lower class (occasionally described as working class) are those employed in low-paying wage jobs with very little economic security. The term "lower class" also refers to persons with low income.
The working class is sometimes separated into those who are employed but lacking financial security (the "working poor") and an underclass—those who are long-term unemployed and/or homeless, especially those receiving welfare from the state. The latter is analogous to the Marxist term "lumpenproletariat". Members of the working class are sometimes called blue-collar workers.
Consequences of Class Position
A person's socioeconomic class has wide-ranging effects. It can impact the schools they are able to attend, their health, the jobs open to them, when they exit the labour market, who they may marry and their treatment by police and the courts.
Angus Deaton and Anne Case have analyzed the mortality rates related to the group of white, middle-aged Americans between the ages of 45 and 54 and its relation to class. There has been a growing number of suicides and deaths by substance abuse in this particular group of middle-class Americans. This group also has been recorded to have an increase in reports of chronic pain and poor general health. Deaton and Case came to the conclusion from these observations that because of the constant stress that these white, middle aged Americans feel fighting poverty and wavering between the middle and lower classes, these strains have taken a toll on these people and affected their whole bodies.
Social classifications can also determine the sporting activities that such classes take part in. It is suggested that those of an upper social class are more likely to take part in sporting activities, whereas those of a lower social background are less likely to participate in sport. However, upper-class people tend to not take part in certain sports that have been commonly known to be linked with the lower class.
A person's social class has a significant impact on their educational opportunities. Not only are upper-class parents able to send their children to exclusive schools that are perceived to be better, but in many places, state-supported schools for children of the upper class are of a much higher quality than those the state provides for children of the lower classes. This lack of good schools is one factor that perpetuates the class divide across generations.
In the UK, the educational consequences of class position have been discussed by scholars inspired by the cultural studies framework of the CCCS and/or, especially regarding working-class girls, feminist theory. On working-class boys, Paul Willis' 1977 book Learning to Labour: How Working Class Kids Get Working Class Jobs is seen within the British Cultural Studies field as a classic discussion of their antipathy to the acquisition of knowledge. Beverley Skeggs described Learning to Labour as a study on the "irony" of "how the process of cultural and economic reproduction is made possible by 'the lads' ' celebration of the hard, macho world of work."
Health and Nutrition
Lower-class people experience a wide array of health problems as a result of their economic status. They are unable to use health care as often and when they do it is of lower quality, even though they generally tend to experience a much higher rate of health issues. Lower-class families have higher rates of infant mortality, cancer, cardiovascular disease and disabling physical injuries. Additionally, poor people tend to work in much more hazardous conditions, yet generally have much less (if any) health insurance provided for them, as compared to middle- and upper-class workers.
The conditions at a person's job vary greatly depending on class. Those in the upper-middle class and middle class enjoy greater freedoms in their occupations. They are usually more respected, enjoy more diversity and are able to exhibit some authority. Those in lower classes tend to feel more alienated and have lower work satisfaction overall. The physical conditions of the workplace differ greatly between classes. While middle-class workers may "suffer alienating conditions" or "lack of job satisfaction", blue-collar workers are more apt to suffer alienating, often routine, work with obvious physical health hazards, injury and even death.
In the UK, a 2015 government study by the Social Mobility Commission suggested the existence of a "glass floor" in British society preventing those who are less able, but who come from wealthier backgrounds, from slipping down the social ladder. The report proposed a 35% greater likelihood of less able, better-off children becoming high earners than bright poor children.
Class conflict, frequently referred to as "class warfare" or "class struggle", is the tension or antagonism which exists in society due to competing socioeconomic interests and desires between people of different classes.
For Marx, the history of class society was a history of class conflict. He pointed to the successful rise of the bourgeoisie and the necessity of revolutionary violence—a heightened form of class conflict—in securing the bourgeoisie rights that supported the capitalist economy.
Marx believed that the exploitation and poverty inherent in capitalism were a pre-existing form of class conflict. Marx believed that wage labourers would need to revolt to bring about a more equitable distribution of wealth and political power.
"Classless society" refers to a society in which no one is born into a social class. Distinctions of wealth, income, education, culture or social network might arise and would only be determined by individual experience and achievement in such a society.
Since these distinctions are difficult to avoid, advocates of a classless society (such as anarchists and communists) propose various means to achieve and maintain it and attach varying degrees of importance to it as an end in their overall programs/philosophy.
Relationship Between Ethnicity and Class
Race and other large-scale groupings can also influence class standing. The association of particular ethnic groups with class statuses is common in many societies. As a result of conquest or internal ethnic differentiation, a ruling class is often ethnically homogenous and particular races or ethnic groups in some societies are legally or customarily restricted to occupying particular class positions. Which ethnicities are considered as belonging to high or low classes varies from society to society.
In modern societies, strict legal links between ethnicity and class have been drawn, such as in apartheid, the caste system in Africa, the position of the Burakumin in Japanese society and the casta system in Latin America.
60. Conley, D. (2017). You may ask yourself: An introduction to thinking like a sociologist (Core 5th ed.). New York: W.W. Norton.