What are virtual methods for?

Question

C++ / C#

What are virtual methods for?
I know that:
1) a pure virtual method makes a class abstract
2) A regular virtual function is needed to correctly call overloaded functions in derived classes
But what is a virtual destructor for, for example?

Answer 1

It is not just needed, it is required if there is at least one virtual function.
Read more: https://habrahabr.ru/post/64280/