Draṣṭā is Patañjali’s word for the self as the pure witness. When the movements of the mind are stilled, he says, the seer abides in its own nature; otherwise it seems to take the form of those movements. The seer is distinct from the seen, which exists for its sake.
Draṣṭā
The seer: in the Yoga Sūtras, pure consciousness, which sees but is not itself seen.
Also: Drashta, the seer