Parallel port: An I/O port that transmits data simultaneously through a parallel interface.

Password: A string that an individual uses together with their user ID for authentication.

Payroll system: A system for calculating each employee's total wages by taking into account factors such as their working hours, T&A(Time and Attendance), and taxes, and paying them the correct amount.

Piggybacking: One of the fraudulent authentication-based access methods where a person without permission to access a restricted zone intentionally enters said zone together with a person who has access permissions. Also called 'piggybacking' or 'piggyback,' this is one of the most typical methods of gaining unauthorized access along with a tailgating. Generally, piggybacking refers to the act of gaining unauthorized access with intent, while tailgating refers to the act of gaining unauthorized access without intent.

PIN (Personal Identification Number): A serial number given to an individual for their identification.

PoE(Power over Ethernet): A system that powers the device through an Ethernet cable. Because this system only requires a single cable to transfer data and supply power to the device, it is easy to install and scale, and can also reduce wiring costs.

Port number: The port number used for intercommunication in TCP/UDP. Its range is from 0 to 65535.

Private authentication: An authentication method where user authentication is performed according to the combination of credentials specified by the administrator. This method takes precedence over other authentication methods.

Punch: An event that indicates the start time or the end time of work.

Punch in: The act of recording the time of arrival at the workplace.

Punch out: The act of recording the time of departure from the workplace.