Answer / rohit sah

An Abstract Base Class is a class that is not intended to be instantiated itself. Rather, it is intended strictly for use as a base for other classes. To prevent instantiation, an ABC will typically contain at least one pure virtual function.

The point of an ABC is to separate the interface of a group of classes from the implementation of the functions that make up the interface. This allows other code to ignore differences in how these functions are carried out. An ABC creates a contract between its descendants and any other code that uses them. The descendants must implement a certain set of functions. Code that uses them must use those functions to access whatever it is the object involved represents.

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