Difference between bubble App and Plugin?

Hey there,

I think I don’t quite get the difference between the bubble app and plugin.
I built my website (which should be a user backend basically fetching the information from an MySQL Database) with the App.

Did I get it right, that the Plugin is for coding and that I can add the plugins I coded in the bubble App? Can somebody give me a good usecase for that?

Thanks in andvance!

Best.
Josi