Why do Word documents have file names?
Everything you save on a computer has a file name. The web page
you are looking at right now is stored as a file - both on the
machine that hosts it, as well as on your machine as a .temp file.
If the Word document you are working on wasn't stored as a file
with its own file name, you would not be able to retrieve it. If
you had a power outage or accidentally turned off your computer,
you would lose all of your work.