Operator overloading is —

Operator overloading: Operator overloading allows existing C++ operators (for example +, -, *) to be given definitions that work with user-defined types (classes or structs). Key idea: You implement operator functions (such as operator+) to specify how an operator behaves for your class. These functions can be member functions or non-member functions.

Example: To add two Complex objects, define a function such as Complex operator+(const Complex& a, const Complex& b) that returns their sum.