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I don't know who Wayland is
(i.imgflip.com)
I use Arch btw
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It's a standard to display programs and let them interact with each other. The old way is X11 which is a big program handling all of that. With Wayland every desktop and window manager (like KDE, Gnome, i3wm, Sway, etc) take up the role of Xorg themselves, giving them better control.
Every program has to be changed to work with Wayland. Those that don't run through Xwayland, a program mimicking the old X11 standards on Wayland.