Whats the difference between aggregation and composition?

Answer

Both are ways of designating or grouping items by relationship. In the case of composition, if the links that bind the objects are broken, then all objects are destroyed. In aggregation, it's a looser grouping, and if the links are broken the original objects still exist.

This sounds better..

"Aggregation differs from ordinary composition in that it does not imply ownership. In composition, when the owning object is destroyed, so are the contained objects. In aggregation, this is not necessarily true. For example, a university owns various departments (e.g., chemistry), and each department has a number of professors. If the university closes, the departments will no longer exist, but the professors in those departments will continue to exist. Therefore, a University can be seen as a composition of departments, whereas departments have an aggregation of professors. In addition, a Professor could work in more than one department, but a department could not be part of more than one university."

http://en.wikipedia.org/wiki/Record_(computer_science)

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