What is the difference between aggregation and composition? Abstract class vs interface.

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Aggregation is a 'has-a' relationship where one object contains another object, while composition is a stronger form of aggregation where the contained object has no independent existence.

Aggregation is a weaker relationship where one object 'has-a' another object, but the contained object can exist independently.
Composition is a stronger relationship where one object is composed of another object, and the contained object has no independent existence.
In aggregation, the contained object can belong to multiple parent objects, while in composition, the contained object is exclusive to the parent object.
Example of aggregation: a car 'has-a' engine, where the engine can exist independently and can be shared among multiple cars.
Example of composition: a car 'is composed of' wheels, where the wheels have no independent existence and are exclusive to the car.

What is the difference between aggregation and composition? Abstract class vs interface.

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