Two desktop sessions after fresh install of Debian 12

I successfully installed Debian 12 (with the KDE Plasma DE) on my PC, and the first time I logged into the desktop environment, I noticed there were two desktop sessions to choose from: 1. Plasma (Wayland) 2. Plasma (X11) By default, Wayland is used. When I tried to log in using my username and password, I was unable to, even though my password was 100% correct. However, when I switched the session from Wayland to X11, I was able to log in successfully. My questions are: 1. Since this is a fresh install of Debian 12, why are there two desktop sessions (Wayland and X11)? 2. Are they interdependent an can I remove Wayland?