I don't know much about Steam except you use it to games on your computer and you can buy games through it. What I do know is that Steam is offering amazing discounts on many popular games right now as part of a Halloween Sale. 33 - 75% off a whole variety of games.
This sale ends November 1st so not much time left to take advantage of it. The majority of the games do seem to be 50% off+ so a goody amount.
Anyone care to explain to me how Steam works?