Change the text cursor/caret in Visual Studio

I've accidentally changed the text cursor/caret in Visual Studio 2010 from the line to the one with the box that highlights the entire character and cannot find out how to change it back. Can anyone tell me how? Thanks!

Press the Insert Key

To clarify there are two modes when using the editor: Insert and Overwrite.

Insert -- the "normal" thin caret that inserts characters as you type.

Overwrite -- the "fat" caret that will overwrite any previous characters as you type.

These two act the same when at the end of your document and you are just typing but go in the middle of some text and use them then you will see the difference.