Want to understand aggregation, association and composition

[Mustehssun]

Hello, I can't make links how do these three things relate to OOP. Secondly, I can't find enough material on them. I mean, even if you search these terms in wikipedia list of terms in OOP they do not show up there. And there's a quiz this morning :| I'm not a very good internet researcher when it comes to my courses. Any tips please? :)