Why use virtual member function

Answer 1

Supose I have a class called Hero with an attack function and i want that all my derived classes from hero implement this function different for example the attack of a ranged hero must be different from the attack of a melee hero , thats why we use the keyword "virtual" couse it allow subclasses to make different implementation of the same function (function attack on the example) deppending on what we need.

Answer 2

thanks