port

1. An input and/or output socket on an electronic device. 2. In a TCP/IP network, a 16-bit number included in the TCP or UDP Transport-layer (layer 4) header. The port number typically indicates the Application-layer (layer 7) protocol that generated a data packet. A port may also be called by its associated service (e.g., port 80 may be called HTTP, or port 23 may be called Telnet). 3. To relocate an application or function to a new platform.