It’s a Linux distro that is gaming focused. Based on Fedora but preloaded with gaming software like emulators and Steam. It’s pretty easy to install and run without knowing anything about Linux so it’s growing in popularity among gamers that don’t like Microslop.

It's kinda like SteamOS, but not. Not managed by Valve, a little more cutting edge, a hair more performant, a hair more customizable, but also immutable, and also very gaming-focused. Comes in flavours for handheld PCs, regular desktop, or home theater gaming PCs, KDE or Gnome, and supports AMD or Nvidia.

Like SteamOS, it's immutable, very beginner-friendly, while also being very open and modifiable like any Linux distro. A strong recommendation for any gamer who's sick of Windows, so it's seen amazing growth.