In object-oriented programming (OOP), inheritance is a way to form new classes (instances of which are called objects) using classes that have already been defined. Inheritance is employed to help reuse existing code with little or no modification. The new classes, known as derived classes, inherit attributes and behavior of the pre-existing classes, which are referred to as base classes (or ancestor classes). The inheritance relationship of sub- and superclasses gives rise to a hierarchy. The inheritance concept was invented in 1967 for Simula.

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