Steam is an online platform for PC videogames. In Steam you can buy games for a very little price that you couldn't buy in your local store for that price, for example. And also, if you buy a game there, you will have it forever, linked to you Steam account. For me, dicoverying this has been a very good motivation for start paying for games again. Every day there are sales, and sometimes there are sales on games that you want. I think it's the future for PC gaming, and also for casual gamers, like me, who doesn't want to spend a lot in a game that, maybe, won't play a lot.