Polymorphism:
o Polymorphism is a Greek term which means ability to take more than one form.
o For example, + is used to make sum of two numbers as well as it is used to combine two strings.
o This is known as operator overloading because same operator may behave differently on different instances.
o Same way functions can be overloaded. For example, sum () function may takes two arguments or three arguments etc. i.e. sum (5, 7) or sum (4, 6, 8).
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