There have many definition about polymorphism and overloading. Some people said
that overloading is one type of polymorphism. While some people said,
they are not the same. Because only one function will be allocate in
overloading. While the polymorphism need allocate the memory for each
redefined member function. Most of the time new bee programmers are confused about it.

Polymorphism and Overloading are two types of functions that are used in
OOP. These are often confused as synonyms
because of their similarity in functioning. However, these two are
different functions and are used to yield different results.
Polymorphism
The word itself explains the clear meaning. 'Poly' means multiple, while
'morphism' means the process of gradual
change from one form to another. Polymorphism feature allows the user to handle different data types and functions with a uniform interface. Thus, same thing will have different forms. Technically, Polymorphism is way of implementing Single Interface in multiple Implementation.
Polymorphism is a general term which refers to both overloading and
overriding.
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