From http://www.w3schools.com (Copyright Refsnes Data)

TCP/IP Tutorial

TCP/IP Tutorial

TCP/IP is the communication protocol for the Internet. In this tutorial you will learn what TCP/IP is, and how it works.

TCP/IP is the Internet Communication Protocol

A communication protocol is a description of the rules computers must follow to communicate with each other.

The Internet communication protocol defines the rules for computer communication over the Internet.

Your Browser and Your Server Use TCP/IP

Internet browsers and Internet servers use TCP/IP to connect to the Internet.

Your browser uses TCP/IP to access Internet servers, and servers use TCP/IP to send HTML back to your browser.

Your E-Mail Uses TCP/IP

Your e-mail program uses TCP/IP to connect to the Internet for sending and receiving e-mails.

Your Internet Address is TCP/IP

Your Internet address "123.19.56.205" is a part of the standard TCP/IP protocol (and so is your domain name "www.someonesplace.com").

From http://www.w3schools.com (Copyright Refsnes Data)