What was the lowest caste in the Indian caste system?

The Scheduled Caste is the lowest caste in the Indian caste system.

Explanation:

Untouchable, Dalit is the other name of Scheduled Caste. In India, caste systems were formed based on the jobs that their ancestors inherited to them. The Scheduled Caste or Dalit people have carried out the low-level jobs such as playing para (played during someone's death), latrine cleaners, street sweepers, etc.

And their jobs were followed to their future generations doing the same work. The influence of Hinduism and some of their literary works preached that Dalit people were untouchable. It is believed that Lord Bhramma was responsible for the creation of lives in the world. These castes system consists of 4 major divisions and each division is compared to the body part of Bhramma.

According to their hierarchy, Bhramins were the top in the society and other castes are below them. And Scheduled Castes were the outcasts which are not the part of Lord Bhramma and considered to be low class and untouchable people by the other castes.