These Varnas were further divided into castes and sub-castes. Originally, caste system was not based upon birth. Now a day, caste is determined by the birth. During medieval period, the persons belonging to a particular caste were supposed to do the same business as of their ancestors. This type of caste system no longer exists. People are free to do whatever they want. Castes come into play mainly during marriages. In arranged marriages, people prefer to marry the person from the same caste.