The full Steam library and all future Steam releases are at your fingertips. After you've purchased a game, download it immediately and start playing. Join the Steam Community Now it's easy to find someone to play with, meet up with friends, connect with groups with similar interests, and host and join chats, matches, and tournaments. Best of all, it's all free. Chat with your friends while gaming With Steam's "Friends" service, you can talk to your friends while you play. You can also see when they're playing games and easily join the same servers together. Easily browse multiplayer game servers Steam's integrated server browser makes it easy to navigate thousands of Internet game servers. Receive automatic game updates Hunting for patches and downloading from unorganized web sites is so twentieth-century. On Steam, your games stay up-to-date by themselves. No hassles. Play your games on any PC Once you have a Steam account, you can sign in from any PC to access your games. Your games are associated with your account, not your computer. Enjoy Steam-only special offers From pre-release discounts to free-play weekends, Steam delivers what gamers value most.
Ahh yes a brief and to the point informative topic is always what we need.
Steam is a community of computer gamers pretty much, and the ID is the user name, simply.
It's also important to point out steam owns ValvE which makes half life and all source Games including Counter Strike, Team Fortress Two, Half Life Two Deathmatch, Day of Defeat source. A common addition and misconseption is portal, but that was made privately and sponsered by steam.
