Wildcards with super

What is Wildcards with super

public static  void copy(List dst, List src) {
        for (int i = 0; i < src.size(); i++) {
            dst.set(i, src.get(i));
        }
    }

The quizzical phrase ? super T means that the destination list may have elements of any type that is a supertype of T, just as the source list may have elements of any type that is a subtype of T.

Example

        List