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port
physical/logical input or output point of a cryptographic module that provides access to the module
source: ISO19790, 2006
A connecting point (gateway or portal) between a computer and another device. Identified by numbers ranging from zero to 65,536, ports enable the establishment of a session between a host and a Web server for network services. Popular services have reserved port numbers: TELNET is at port 23, and HTTP is at port 80, for example. Ports are usually targeted for attack by hackers and Trojan horses in order to gain access to a computer system.
source: D. Schweitzer, 2003, Incident Response: Computer Forensics Toolkit
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