Social inequality is a universal phenomenon in all societies. It can exist either in form of a hierarchy of groups or individuals or it may exist without the creation of a hierarchy. In the former case it is called social hierarchy. While in the latter case it is known as social differentiation for in almost all societies men and women are treated unequally. If social inequality manifests itself in the form of a hierarchy involving ranking of groups then it is known as social stratification, thus social stratification is a particular case of the social inequality. Social stratification is essentially a group phenomena.According to Ogburn and Nimkoff the process by which individuals and groups are ranked in a more or less enduring hierarchy of status is known as stratification. Melvin Tumin defines social stratification as an arrangement of any social group or society into a hierarchy of positions that are unequal with regard to power, property, social evaluation and psychic gratification. According to Lundberg a stratified society is one marked by inequality by differences among people that are evaluated by them as being lower and higher.
There are two approaches to the study of stratification:
Conflict Approach under which Karl Marx and Weber's theories come.
Functionalist Approach under which Talcott Parsons and Davis and Moore's fall.