Use of pointer?

Question

1 run time linking DLL
2 store address of another variable
3 save memory and run faster because it does not have to duplicate the data

Answer 1

The second pretty much covers it all. The rest are consequences.

Answer 2

say other uses than this.

Answer 3

?

Answer 4

It allows us to perform the dynamic memory allocation. And allows us to re-size it too.