C++ Abstraction Explained: Key Concepts for Technical Interview Prep

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A concise revision guide published on DEV Community covers the core concept of abstraction in C++, aimed at developers preparing for technical interviews. Abstraction involves exposing only the essential behavior of an object while hiding its internal implementation details, reducing complexity and promoting loose coupling. In C++, abstraction is primarily achieved through abstract classes containing pure virtual functions, which act as contracts that concrete derived classes must fulfill. A practical example illustrates how an e-commerce checkout system can interact with multiple payment providers through a common interface without depending on specific implementations. The guide also distinguishes abstraction from encapsulation and clarifies the difference between abstract classes and pure abstract classes, noting that C++ lacks a dedicated interface keyword.

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