!!! Overview
[{$pagename}] is one of the four fundamentals of [Object-oriented Programming]

[{$pagename}] is when an [object] or [class] is based on another [object] (prototypal inheritance) or class (class-based inheritance), using the same implementation (inheriting from an object or class) or specifying a new implementation to maintain the same behavior (realizing an interface; inheriting behavior; programming by difference[1]). 

Such an inherited class is called a subclass of its parent class or super class. 

[{$pagename}] is a mechanism for code reuse and to allow independent extensions of the original software via public classes and interfaces. The relationships of objects or classes through [{$pagename}] give rise to a [hierarchy]. 

[{$pagename}] was invented in [1967|Year 1967] for Simula.

The term "[{$pagename}]" is loosely used for both class-based and prototype-based programming, but in narrow use is reserved for class-based programming (one class inherits from another), with the corresponding technique in prototype-based programming being instead called delegation (one object delegates to another).

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