How supabase authorization works

I've read the docs and I'm curious about this part https://supabase.com/docs/guides/auth#how-it-works
4. Postgres inspects the JWT to determine the user making the request.
question: when it says "postgres inspects the JWT", does postgres actually query the database to match a stored JWT ? or how postgres "inspects" the JWT?
thank you in advance for the answers
Supabase Documentation
Use Supabase to Authenticate and Authorize your users.
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