A number from 0 through 1023 used to identify a network service on an IP network. Residing in a field in the TCP or UDP header, the port number directs packets to the appropriate application in the server. The most well-known port is 80, which identifies HTTP traffic for a Web server.
For a list see: Category:Ports
Note that well known ports are only those, that are in the range of 1 - 1024 and registered with the IANA, while there are also registered port[other unregistered ports, that may be commonly used, but cannot rely on it or complain on conflicts with other software.