Caste discrimination is both a global phenomenon and of global concern. Caste imposes enormous obstacles to their full attainment of civil, political, economic, social and cultural rights. Under various caste systems throughout the world, caste divisions also dominate in housing, marriage, and general social interaction – divisions that are reinforced through the practice and threat of social ostracism, economic boycotts, and even physical violence. Often, rigid social norms of purity and pollution are socially enforced through strict prohibitions on marriage or other social interaction between castes. But the old patterns of caste system are changing rapidly for various reasons. That‘s why I select this topic and try to know about the changing trend in the caste system in details.