CSS "body" background image source

Hello and good day—

I am playing around with how this works. using the tutorial on w3schools.com, I’m learning how to make an image into the background for any given page. Using a command, such as: body {background-image:url(‘paper.gif’);} how would I tell the web site where the photo/image is located? For instance, I have a pic on my desktop with the filename “Engraving.” My hard drive is the C: drive.

How would I figure what folder/path to tell the program to look in, to grab that image? Or does the image need to be in the set of files hosted at Godaddy?