Which term describes simplifying complex reality by modeling classes appropriate to the problem domain and focusing on essential features?

• A. Encapsulation
• B. Inheritance
• C. Polymorphism
• D. Abstraction

Answer: (D)

Focusing on essential features and modeling only what matters to the problem domain is abstraction. Abstraction helps you create simple, usable models by identifying the key entities and the important attributes and behaviors they share, while ignoring irrelevant details of the real world. This lets you reason about the system at a level that matches what you actually need to solve, without getting bogged down in every possible nuance. Encapsulation hides internal data and requires access through methods, but it doesn’t specifically drive the simplification of the problem space. Inheritance builds hierarchies to reuse code, and polymorphism lets different objects be treated through a common interface; neither centers on filtering complexity to reflect essential domain features like abstraction does. So the term that best describes simplifying reality by modeling classes appropriate to the problem domain and focusing on essential features is abstraction.