I know I could duckduckgo it, but I think we're at the stage at lemmy where there's space to ask basic questions.
What is it? Why does it matter? Users at which lunix proficiency level should care about it? Is it just yet another competing standard or is x actually going to die?
You’ve already gotten great answers on what Wayland is, but as far as who should care:
Mainly developers and users with niche workflows. People with NVIDIA cards should care a little as initially NVIDIA did not support Wayland, but NVIDIA drivers are catching up so this should continue to improve. Most users should just switch when their DE switches.