Brazil's second goal against Ivory Coast?

I'm currently watching Brazil and Ivory Coast and the ball hit Fabiano's arm twice before it went in. The first it hit was right above his hand, than below his shoulder. And the second one you can clearly see him pop his shoulder, changing the initial outcome. Isn't that a hand ball? I'm confused about hand because Ghana scored a penalty goal against Serbia after the ball hit a players arm, clearly he didn't change direction. So whats a handball? :)