When you send any information over the Internet, the Transmission Control Protocol (TCP) breaks the information into "byte-sized" sendable "packets." If you do any work in the information technology arena, you will recognize the term packets. (And byte-sized? A byte is a unit of storage in the IT industry equal to about 8 bits. Bits are also storage units, but bits and bytes are not the topic of this article, so we'll reserve further discussion for another time and place). So, when you send something, the TCP breaks that something into packets. Many things go into packets including Internet Protocol address as well as sending and recipient information. These packets of information go from computer to computer by way of routers.
Routers, well, route information from one computer to another or from one system to another. Routers constantly examine each piece of information using the Internet Protocol (IP). The router is able to determine the best route to route the information because of the IP header information contained in the packet. Confused yet? Well, after you start dabbling in it a bit, it'll get easier.
To recap, the TCP breaks up information into packets. The IP transmits the information via routers strategically stationed throughout the internet. (Many people have personal routers and it operates on the same principle. Information is forwarded through the router onto its destination). After the routing has occurred, the packets arrive at their intended destination. TCP comes into play again. It sorts the information based on information contained in the IP header and reassembles it. And this happens billions of times every single day on the World Wide Web. The TCP/IP acronyms almost always go together, and now you can see why. They don't go together all the time, but often enough to make you think that they were made for each other.
Source : goarticles by Mortimer Greenberg
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