Rules imposed by caste system are

1) Castes are determined since birth of the child, it is not a matter of choice and it was not to be changed.

2) One cannot marry a person who is not the member of his/her own caste. It is endogamy recognised under caste system.

3) Person of a particular caste shall have to strictly observe the rules of food and food sharing.

4) A person born into a caste can only practice the occupation associated with that caste, like the son of a barber will be barber, etc

5) Shudras and untouchables were born to serve the upper castes, they cannot share food with upper caste individuals.

6) Caste involves hierarchy of rank and status every person has a caste; every caste has a sub-caste and every caste has a specified place in the hierarchy of all castes.

7) Castes involved subdivision within themselves sometimes sub-castes also have sub-caste.