What is port ?

A port is a door through which data enters or leaves your computer . Typically ports are used to exchange data between different devices. There are two types of ports :

•   Hardware ports : All of us use hardware ports like USB ports , parallel ports , Ethernet ports . these are normally used to exchange data between two devices.

• Virtual ports : All web application no your computer open something known as virtual ports on your computer to communicate with remote servers on the internet . Without virtual ports there would be no way for application on your computer to communicate with remote server on the internet. You can find a list of open virtual ports on your computers by simply going to the MS-DOS prompt and typing the command netstat-n .