The caste hierarchy means the system of social stratification in our society. Broadly speaking, caste system is a process of placing people in occupational groups. It has pervaded several aspects of Indian society for centuries. It dictates the types of occupation a person can pursue and the social interactions that he/she may have. Castes are ranked in hierarchical order, which determines the behaviour of one member of society over and other.

Besides voting, the caste is an important factor, influencing the selection of candidates in elections, appointment of ministers, transfer and posting of public officials etc. The policy of reservation has given further impetus to the role of caste in politics. Caste plays a very important role in elections and voting. Political parties select their candidates on the basis of caste composition in the constituency. The voting in elections and mobilisation of political support from top to bottom moves on the caste lines. Caste functions as a pressure group in politics. Political bargaining is also done on caste lines.