Embedding Jitsi Meet API

I want to embed meet.jit.si in my web app.
Now in API where it says
api = new JitsiMeetExternalAPI(domain, options)
what will be the domain?
You said -

domain used to build the conference URL, ‘meet.jit.si’ for example.

Will it be the URL of my domain where I’ll embed it or meet.jit.si or meet.jit.si/roomname?