When you try to close a document, Word will ask you if you want to save it first (see save file). This is a safety measure so that you do not accidentally close files without saving them. If you want to keep a file, you must save it before closing it.

To close a file (assuming that you have saved it)

Click on the Office button

Click on Exit Word

The other way in which you can close a file is to use the buttons on the very top right of the screen. Click on the X to close the Word application.