The HP Printer (Fax) Windows driver is a software component that enables a printer with faxing capabilities to function as both a printer and a fax machine on a Windows computer. Many HP multi-function printers (MFPs) include fax functionality in addition to printing and scanning, and this driver is necessary for Windows to communicate with the printer's fax features.

This driver allows the computer to send and receive faxes through the connected HP printer, as well as configure fax settings like sending a fax from an application (e.g., Word or Excel), receiving faxes, or using fax-related features from the printer's control panel.