Not only Inheritance

Composition “has-a” (strong connection)

Building has a room. Containing object owns it. Objects' lifecycles are tied (if we destroy the owner object, its members also will be destroyed with it)

Aggregation “has-a” (medium connection)

Сar and its wheels. We can take off the wheels, and they'll still exist. Doesn't involve owning. Lifecycles of the objects aren't tied: every one of them can exist independently of each other.

Association objects “know” each other (weak connection)

Mother and child. The difference with aggregation is only logical: whether one of the objects is part of other or not.