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3 meanings.
First and most generally, a place where information goes
into or out of a computer, or both. E.g. the serial port
on a personal computer is where a modem would be connected.
On the
Internet port often refers to a number that is part of a
URL, appearing after a colon (:) right after the domain
name. Every service on an Internet server listens on a particular
port number on that server. Most services have standard
port numbers, e.g. Web servers normally listen on port 80.
Services can also listen on non-standard ports, in which
case the port number must be specified in a URL when accessing
the server, so you might see a URL of the form:
gopher://peg.cwis.uci.edu:7000/
This shows a gopher server
running on a non-standard port (the standard gopher port
is 70).
Finally,
port also refers to translating a piece of software to bring
it from one type of computer system to another, e.g. to
translate a Windows program so that is will run on a Macintosh.
See
also: URL
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