Aggregation & Composition

Aggregation
Aggregation means “has-a” relationship. Here the two entity are dependent on each other but the can exist alone as well.
eg: Person and Shirt entity. Shirt is dependent upon the person who wears it, but it can exist alone as well.

Composition 

Composition means “is-a” relationship. Here the two entity are tightly dependent on each other and can’t exist alone.
Eg: Human and Heart they both are dependent on each other and can’t exist alone.

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