Need to move a shape or a picture into an exact position but can't get it positioned just right using the mouse?
Nudging lets you move something a tiny distance so you can get it positioned precisely the way you want.
How to nudge a shape:
Some exceptions:
Nudging is affected by snapping behavior which you control by going to the Drawing toolbar (View | Toolbars), clicking the Draw menu, then Snap. If you're snapping to the grid, this will affect your nudges, so turn that off to get more precise movement.
There are also Nudge menu items on the Drawing toolbar, but I really don't see the point since if you're going to go to the trouble of clicking that, you might as well just drag the shape directly.
Finally, if you're a Publisher user, you can set the exact nudge distance.