Wayland is a communication protocol that specifies the communication between a display server and its clients. ... The aim of Wayland is replacing the X Window System (Also known as X11, or Xorg) with a modern, secure, and simpler windowing system.

Is Wayland better than X11?

Wayland is also superior when it comes to security. With X11, it's possible to do something known as “keylogging” by allowing any program to exist in the background and read what's happening with other windows open in the X11 area. With Wayland this simply won't happen, as each program works independently.

What is the replacement for X11?

The X' and is an app in the OS & Utilities category. There are three alternatives to X11 for Linux and Mac. The best alternative is Wayland, which is both free and Open Source. Other great apps like X11 are XQuartz (Free, Open Source) and Mir (Free, Open Source).