I wouldn’t try to put nostr in a box or compare it to twitter. Twitter is a client app that connects to a Twitter server.

Nostr is a protocol

Your just using an app and relays to communicate using nostr.

This May be a bad analogy, but here goes…

If a web server is a relay then the browser is Damus (or Iris, Amethyst etc…) And that would make nostr HTTPS.

If someone has a better description, please step in. 😊