Association
Relationship between two objects (one to one, one to many, many to many etc)
Aggregation
Aggregation is a kind of association, which refers Has a relationships.
Example: Building has a room
Composition
It is a kind of Aggregation but when an object contains another object the contained object cannot exists without the container object
Example: Room cannot exist without building
Generalization
Generalization refers to Is a relation ship (Inheritance)
Example, Car is a Vehicle, Bus is a Vehicle
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