How to Copy object without duplicate ?

Hello All !
I am kinda new to blender. I can’t figure how to copy an object. For example i modify the vertice of an UV sphere, then i make a little animation (moving it and using keyframes “loc”). Then how do i copy the sphere ? If i use ctrl D or Alt D, the problem is that if i modify the duplicate object it affect the original one. How can i copy my modified UV sphere ?
Thanks a lot for your answer…



it should be the “shift+d” combination.
it makes a copy but changes on that copy have no effect on the original.
try it.