What were sudras?

The Sudras are the "low-class" people from the Caste System.

they are usually servants, non-aryans, and etc

the Caste System contains four main castes.

they are the brahmins which are usually priests, scholars, and teachers.

the kshatriyas is the second caste; they are the warriors, soldiers, and rulers

vaishyas is the third caste. it has the merchants and traders

and the sudras ^^^

once you are born in a caste you will have to remain in that caste