9 HTTP, SMTP, NNTP and more - Protocols discussed

In the previous post we gave an introduction about this blog and its contents.
In this post we'll be introducing some commonly used  protocols.

First let us see "What is a PROTOCOL?"
A protocol is a set of formalized rules that explains how data is communicated over a network. Think of it as the language spoken between computers to help them communicate more efficiently.

Now let us take a look at some protocols and commonly used port numbers for their services:

• HTTP stands for  HyperText Transfer Protocol. 

It is the data transfer protocol used on the World Wide Web. 
It runs on port 80.

• SMTP stands for Simple Mail Transfer Protocol

It is a protocol for sending e-mail messages between servers.

It runs on port 25.

• NNTP stands for Network News Transfer Protocol

It is the predominant protocol used by computer clients and servers for managing the notes posted on Usenet newsgroups. 

It runs on port 119.

• POP stands for Post Office Protocol

It is a protocol used to retrieve e-mail from a mail server.

POP3 runs on port 110.

• FTP stands for File Transfer Protocol.

It is a protocol used for exchanging files over the Internet. 

It runs on ports 20 & 21.

• IMAP stands for Internet Message Access Protocol.

It is a protocol for retrieving e-mail messages.

It runs on port 143.