Rooted in religion and based on a division of labor, the caste system, among other things, dictates the type of occupations a person can pursue and the social interactions that she may have. Castes are an aspect of Hindu religion. Other religions in India do not follow this system.
-istan is a suffix in the Persian language (Farsi), denoting a place. Thus, Pakistan means place of the pure (pak=pure). It does not just refer to geographical areas, as in bimarestan=place of the sick=hospital. The suffix is widespread in Eurasia because of Persian influence (the Mughals of India for example used Farsi).
For other uses, see Karachi (disambiguation). Karachi (Urdu: Ú©Ø±Ø§ÚÛâ; Sindhi: ÚªØ±Ø§ÚÙâ; ALA-LC: KarÄcÄ«, IPA: [kÉËrÉËËtÊi]) is the capital of Sindh, and is the largest and most populous city in Pakistan, as well as the 7th largest in the world and the world's second most populous city proper.