The violin used in Indian classical music is similar to the one used in Western classical traditions.
In Carnatic music, the tuning is the same. The tuning is slightly modified for the Hindustani violin, but the playing style remains the same- sitting cross legged on the floor with the scroll of the violin resting on the right foot of the player.
The violin has evolved to become the principal accompaniment for Carnatic music, and is believed to have been introduced into the Indian tradition by Baluswamy Dikshitar, brother of Muthuswamy Dikshitar (one of the Trinity of Carnatic music composers).
The violin is also extensively used as a solo instrument in both Carnatic and Hindustani styles. It is accompanied by the mridangam, tabla, and allied percussion instruments like the ghatam.