In aryan society, People were divided into social groups based on occupation.
The group was divided into 4 strata, the highest one is for the people who held priest or academics as an occuppation, the 2nd highest is for government officials and warriors, the 3rd highest is for merchants and landowners , and the lowest is for the servants.
Yes, it change overtime, For example, priest no longer placed the highest within the social groups as scientific knowledge start to develop