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).
Pakistan (Islamic Republic of Pakistan) is situated in South Asia. Pakistan is one of the most beautiful countries because of some extra ordinary National Parks and vertical limits. Pakistan is a group of people with a variety of culturures, languagues and religeons. Population of Pakistan exceed 199 million people and it is the 6th most populous country of the world.