Historians believe that the Harappans were most likely a Dravidian people. The Dravidians are a linguistic group that is native to South Asia, and they are thought to have originated in the Indus Valley region. The Harappan language is not known for certain, but it is thought to have been a Dravidian language.
The Harappans were a highly advanced civilization. They built large cities with well-organized streets and drainage systems. They also developed a system of weights and measures, and they were skilled in metallurgy and pottery.
The Harappan civilization declined around 1900 BCE. The reasons for this decline are not fully understood, but it is thought that climate change and invasion by Aryans may have been contributing factors.
The Harappan civilization was a major influence on the development of South Asian culture. The Aryans who invaded India in the 2nd millennium BCE adopted many Harappan cultural practices, and the Harappan civilization is considered to be the foundation of Indian civilization.