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Normal virtual function never call base functions where as virtual destructor call base virtual destructor in Epilog.

The virtual destructor invokes the derived class destructor dynamically. After this it calls the immediate base class destructor statically. This sequence of destructors gets called from the the class derivations in the reverse order.

When derived class object is deleted using the pointer of base class object, both destructor functions of derived class and base class gets invoked. In case of simple virtual function call using base class pointer, only derived class function
gets invoked.

Compilers are responsible for calling destructors as well as constructors when object is deleted or created respectively ). So in case of virtual destructors compiler makes sure both derived class followed by base called descrutors are called i.,e in reverse order of creation. This would ensure cleanup of the object completely and cleanely

-Virtual destructor doesn't need V-table creation.
-Destructor can't be override in child class.
-If you are making it pure virtual, you have to provide definition in base class itself.