Originally Posted by intrinsic
Games "drop" cards. Really, all that means is, launch a game and leave it open for a few hours and you'll find those cards in your inventory. You can play the game if you want, it doesn't matter after launching it.
Badges are crafted from those cards. Badges, as far as I can tell, reward stuff like profile backgrounds and vanity items like that. Alternatively, you can sell your cards on the marketplace for between 11-50 cents.
I also noticed "the bigger picture" it was almost like the Steam application became an interactive tutorial thing like when you buy a new computer..
Thanks for clearing that up, would rep.
Also, how do you make the badges, I clicked on the cards but all I could do was zoom in and then zoom in some more.