In TCP/IP networking, an endpoint of a logical connection between two hosts on an internetwork. Ports are identified by port numbers. A port identifies a unique process for which a server can provide a service or the client can access a service. Ports can be Transmission Control Protocol (TCP) ports or User Datagram Protocol (UDP) ports, depending on the type of service supported.
In general networking terminology, a port is a connector for attaching cables or peripherals to a computer - for example, a parallel port for connecting a printer to a computer or a serial port for connecting a serial mouse or modem to a computer. Connectors on networking components, such hubs or routers, are also sometimes called ports, although a better term for a connector on a router is a «router interface».