Dear Aspirant

Stray round is conducted by state counselling authorities after the mop-up round. It is done when seats are left even after mop up round. For this the authorities will send a list of candidates ten times the number of vacant seats to the respective authorities of the institutes. Candidates will not be allowed to do fresh registrations for the same. Deemed/Central Universities will conduct the final stray vacancy round.

For more information use this link for answers to Faqs

NEET 2020 Counselling FAQs - All India Quota, State Quota & Others (careers360.com)

Hope this helps