A Question plz

Hi again

I have a question plz: What does the post format mean (Standard, Aside, Audio,..etc)? Where is it used? As I see there’s a mark that appears on the posts’ page next to the post and the “Quote” post appears like a quote 🙂 other than that, I don’t know.. and it’s not mentioned in the documentation.

Thanks

http://wordpress.org/extend/plugins/commons-in-a-box/