You can send and receive faxes using your computer's fax/modem. If the document you want to fax is on paper, scan it first, and then send the scanned image. When you receive a fax, your computer saves it as an image file which you can save or print.
To prepare your computer to send and receive faxes, first connect your computer's modem to your phone line using a standard phone cable. Then prepare your computer.