Port is that which transfers data from one computer to 
another via a cable that links connecting ports.

Its nothing but logical address
that is 0 to 1023, these are resrved for servers
remaining 1024 to 65535 are clients

A port is a connector for attaching cables, for example: 
Parallel port is used for connecting printer with system 
and Serial port is used for connecting monitor with CPU.

On computer and telecommunication devices, a port is 
generally a specific place for being physically connected 
to some other device, usually with a socket and plug of 
some kind.
 In programming, a port is a "logical connection place" and 
specifically, using the Internet's protocol, TCP/IP, the 
way a client program specifies a particular server program 
on a computer in a network.

Port is that which transfers data from one computer to 
another via a cable that links connecting ports.