From Computer Science Wiki
Jump to navigation Jump to search
This page is linked to networks and networking. [1]

In computer networking, a port is a communication endpoint. At the software level, within an operating system, a port is a logical construct that identifies a specific process or a type of network service. Ports are identified for each protocol and address combination by 16-bit unsigned numbers, commonly known as the port number. The most common protocols that use port numbers are the Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP).[2]

I like the analogy that an IP address is like an address to a big apartment building, and a port is the address of a specific apartment within the building.



A network socket is an internal endpoint for sending or receiving data within a node on a computer network.[3]

A TCP socket is an endpoint instance defined by an IP address and a port in the context of either a particular TCP connection or the listening state.

A port is a virtualisation identifier defining a service endpoint (as distinct from a service instance endpoint aka session identifier).

A TCP socket is not a connection, it is the endpoint of a specific connection.

There can be concurrent connections to a service endpoint, because a connection is identified by both its local and remote endpoints, allowing traffic to be routed to a specific service instance.

There can only be one listener socket for a given address/port combination.[4]


This video is perfect to give you a very basic idea of sockets:


a group or system of interconnected people or things.

Develop information in a diagrammatic or logical form.

a group or system of interconnected people or things.

A unit of abstract mathematical system subject to the laws of arithmetic.

The circumstances that form the setting for an event, statement, or idea, and in terms of which it can be fully understood and assessed.

Give a specific name, value or other brief answer without explanation or calculation.