Why were people not allowed to join the caste system?

The Caste System in India was a rigid social hierarchy that dictated one's social status, occupation, and marital prospects based on birth. People were not allowed to join different castes because the system was designed to maintain social order and control, with strict rules governing interactions and relationships between castes. This exclusivity reinforced social stratification and marginalized those outside the system, particularly the "untouchables" or Dalits, who faced severe discrimination and exclusion. Thus, the caste system perpetuated inequality and limited social mobility.