What is aggregation? How is it related to composition? Explain role of abstract class design with the help of example. in system

Aggregation is a type of association in Object Oriented Analysis and Design (OOAD) that represents a "has-a" relationship between two classes, where one class contains a reference to another class but does not own it completely. It implies a whole-part relationship where the part can exist independently of the whole. In other words, aggregation models relationships where the lifetime of the part is not managed by the whole. For instance, consider a “Department” class and a “Professor” class. A department may consist of several professors, but ___ ____ __________ _______ _____ _______.
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