Steam is a video game app store for PCs. Back when MS added their app store to windows, the people who make steam (Valve) started working on Proton (wine based

Steam is a video game app store for PCs. Back when MS added their app store to windows, the people who make steam (Valve) started working on Proton (wine based?) to get windows video games to work on Linux. Originally Valve said Ubuntu was the only Linux distro they officially supported. Then they started their own distro based on Debian. then they switched to their distro to arch. TLDR Valve, the company that makes Steam, works on getting games to work on Linux, but they have been kind of all over the place.