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# Aggregation and Composition
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Aggregation and Composition are subsets of associations meaning they are specific cases of association.
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In both aggregation and composition object of one class "owns" object of another class. But there is a subtle difference.
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In both aggregation and composition object of one class "owns" object of another class. But there is a small difference.
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## Aggregation
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Aggregation implies a relationship where the child can exist independently of the parent. Example: Lecture (parent) and Student (child). Delete the Lectureand the Students still exist.
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Aggregation implies a relationship where the child can exist independently of the parent. Example: Lecture (parent) and Student (child). Delete the Lecture and the Students still exist.
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### Example
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