Hi Friend, I am Sofia Carter. WPS pin for HP printer is a secure eight-digit number. It is created to protect the printer from any kind of untoward action by malicious malware and virus. Here, the malware or the virus refers to the malicious activity purposely done by somebody. The intrusion can also be in the form of someone trying to access your printer without your permission. It acts as a permission manager between the wireless router and the printer. Unless the WPS Pin is entered, the printer cannot be operated through the router. The WPS pin can be found on the screen of the printer.