I wasn’t looking for the actual definition…

I haven’t use XMPP much. Matrix is kind of a nightmare. It has most of the important things of a chat platform but as others have said, is a pain in the butt to use. Encryption issues, slow loading, images not loading, etc. It’s also basically on-par with something like WhatsApp, security-wise, in that your message content is encrypted but pretty much nothing else is, and when 90%+ of users are in the matrix.org domain anyway, that’s not acceptable, in my opinion.

I would recommend SimpleX instead.

Define “working”.