Sanskrit is a standardized dialect of Old Indo-Aryan. Its linguistic ancestry can be traced back to Proto-Indo-European. The Indo-Aryan migration theory proposes that the Indo-Aryans migrated from the Central Asian steppes into South Asia during the early 2nd millennium BC, which brought the Indo-Aryan languages. The main script used to write Sanskrit is Devanāgarī, but it can be written in the scripts of various other Indian languages and is sometimes written by the Latin alphabet. 