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X11 vs Wayland
(sh.itjust.works)
From Wikipedia, the free encyclopedia
Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
Security
When you use X11, you allow any program running on your computer to access anything on your screen and clipboard, collect your keystrokes and type. It's trivial to implement a keylogger, for example. Do not buy into the whole "no viruses on Linux" thing, it's not true and likely to become even less and less true, as desktop Linux is becoming popular.
Wayland at least tries to put some barriers in place against this.