What is the difference between association, aggregation and composition?

Question

What is the difference between association, aggregation, and composition? Please explain in terms of implementation.

Answer 1

Composition: This is where once you destroy an object (School), another object (Classrooms) which is bound to it would get destroyed too. Both of them can't exist independently.

Aggregation: This is sorta the exact opposite of the above (Composition) association where once you kill an object (Company), the other object (Employees) which is bound to it can exist on its own.

Association.
Composition and Aggregation are the two forms of association.