Is RLS in Supabase is similar as Security rules in Firebase?

Hello, I am new to backend dev and also I am coming from firebase and I am trying to understand some features in Supabase.

In Firebase, to ensure a user is accessing their own data there are security rules that can be added.

In Supabase, I've found RLS when I've read it, it feels like it is similar as Security rules in Firebase but I am totally not sure?

If they are not similar, how to make sure on Supabase is accessing their own data and not everyone's else.

P.S: I am using authentication from some third party service.
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