Steam is a game service made by Valve. You buy games for it. It also has Free to Play games (like TF2). It has weekly and summer/winter/etc deals. Steam also has a thing called Steam Workshop in which you can download mods for Skyrim/Garry's Mod(at least in the GMOD 13 beta). Also with Steam Workshop you can vote for your favorite TF2 hats/weapons/etc. that might make it into the game. That's it. Now go download it.
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