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A WPS Pin is an 8- digit security password that helps in making a secure connection between the printer and the wireless network (WiFi). This highly secured Pin number is encrypted with the WPA and WPA 2 personal security protocols making your connection safe and secure. While setting up your printer, if you are using a wireless network, you have to enter this number else the setup will not complete successfully.https://www.hpprintersupportpro.com/blog/find-the-wps-pin-on-my-hp-printer/