First off, a little bit of
history about Valve's Steam service and the its upcoming custom OS, SteamOS.
Steam is a DRM based, online gaming service/store. It sells games, both indie
and AAA, and usually has some crazy discounts on games year round. Steam is the
creation of Valve, the studio behind the Half-Life and Portal games, as well as
the massively popular Team Fortress 2 and Dota 2. Steam is the definitive
online gaming service with the biggest library and user base.