Varna is a system of social division prevalent in ancient Hindu society , originating from the Vedas. The Vedas as the oldest literary source are the source of the caste system of society. Originally based on the Brahmanical view, the caste doctrine was created for a special occasion which remained virtually unchanged. Maintaining ethnic purity is a key issue in the concept of caste. According to the ethnic chronology, all the races of the society have been divided into four different classes namely- Brahmin , Kshatriya , Vaishya and Shudra. According to the sukta of the Rikveda, Brahma himself is the creator of the four castes. From the mouth of Brahma, Brahmans have been created whose work is worship and teaching. Many have created Kshatriyas whose job is to defend the country and run the state. From the thighs of Brahma are created the Vaishyas , whose work is trade and agriculture. Shudras have been created from the feet of Brahma whose job is to serve the remaining three higher clans. There is one more letter out of these four letters. This fifth part is Chandal or Untouchable. There are two common ideas about Chandals. One idea is that they lived outside the original settlement. They may not have had access to them or they may have set up their homes in separate places for food collection or other reasons. Their language was not understood by Indo-Aryan speakers. Their occupation was considered to be a very lowly occupation , such as hunting or preparing reed mats. Another theory is that as the cities of the Indo-Gangetic plain grew in size, some marginalized populations were formed who were later employed as servants. Nowadays there is no social barrier in recruiting Chandals in different professions. In modern India, the word Chandal is used to mean something reprehensible , dirty or vile.