As you drag the fill handle you will see?

The fill handle is a tool used in Microsoft Excel. It has various uses in terms of the way it can copy things, so you may see different things on different instances of you using it. As you drag the fill handle, you will see an outline of the area that is to be filled. You may also see values in tip text form beside the fill handle. When you stop dragging, the cells will be filled and you may then see the Autofill icon beside the fill handle.