WPS Pin is an abbreviation for the WiFi protected setup pin; this is an alternative method of the pushbutton to connect your printer to the wireless network. You can get this unique pin at the back of your router or from the printer control panel as well. Many users prefer a wiereless connection over the Ethernet network. Still, it requires you to connect through pin or commonly known as the WPS pin, which is a unique code for every printer and system.https://www.hpprintersupportpro.com/blog/find-the-wps-pin-on-my-hp-printer/