I am also a noob, but here is how I think it is: What your Computer is doing is not what you see. Until now we were using an oldschool way to display stuff called X11 aka. Xorg.

But this is very old and has 3 problems:

• It is very old and hard to improve (code very complex, spagetthi, whatever)
• Has security problems (I dont know what or how)
• No modern features yet (HDR, and so on)

Because people want to use new display features to work and security, people built this display software code whatever new from scratch. And this is Wayland.