[Dev-C++] Virtual functions?

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Hi List,

I've been through numerous books & websites on this topic, but I _still_
can't quite understand what is the purpose of a virtual function.

From what I understand, a virtual function is defined in a base class, but
isn't implemented there. The implementation goes in the derived class. Now
if this is true, then why should I need to define a function in my base
class at all? Since I'm eventually going to implement it elsewhere, I might
as well define it there too.

Am I even on the right track here? Can someone take me back to base again?

Thanks.

Regards,
Pranav Negandhi