C++ polymorphism

[asp]

Hello,

 

I've got a course this year which handles object oriented programming in C++.

Everything went fine, was easy, untill I met polymorphism.

 

I understand the concept, I also can work with it (don't ask me how).

But what I don't understand is how it works; is it really used alot? What does the compiler do with it? And how does the virtual functions table work?

 

Thanks in advance!