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A virtual function is a special type of function that resolves to the 
most-derived version of the function with the same signature.
for the virtual function , the derived class can provide self virtual function 
to instead base class or derive the virtual function from base class.

for example :

class Base
{
protected:
 
public:
    virtual const char* GetName() { return "Base"; }
};
 
class Derived: public Base
{
public:
    virtual const char* GetName() { return "Derived"; }
};
 
int main()
{
    Derived cDerived;
    Base &rBase = &cDerived;
    cout << "rBase is a " << rBase.GetName() << endl;
 
    return 0;
}

ref : http://www.learncpp.com/cpp-tutorial/122-virtual-functions/
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