What is virtual function and why it is used?

Question

In polymorphism module of C++ tutorial (solo learn) I could not understand what was meant by line "Every derived class will override the attack() function and have a separate implementation"
https://www.sololearn.com/learn/CPlusPlus/1911/
Can anyone explain?
Also please tell What is virtual function and why it is used?

Answer 1

Get more information about this from here ..

https://www.google.com/amp/s/www.geeksforgeeks.org/virtual-function-cpp/amp/

https://www.javatpoint.com/cpp-virtual-function