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overloading means assigning a different meaning to this operator, and is usually used to assign a function call to an operator. whenever this operator would be used on such an object in a program, this function would be called with the lvalue and rvalue as parameters. equipped with that information, it can perform the operation it intends the "=" operator to have (usually an extended form of copying).
if you define an object in such a language, you have the possibility of overloading the "=" operator, which is usually responsible for assigning the contents of the lvalue (result of the evaluation of the left side of the operator) to the rvalue (same for the right side).
