Using Names and the Domain Name System
Can you imagine a world in which every time you used an application, you had to think about the other computer and refer to it by IP address? Instead of using easy names like google.com or facebook.com, you would have to remember and type IP addresses, like 74.125.225.5. Certainly, that would not be user friendly and could drive some people away from using computers at all.
Thankfully, TCP/IP defines a way to use host names to identify other computers. The user either never thinks about the other computer or refers to the other computer by name. Then, protocols dynamically discover all the necessary information to allow communications based on that name.
For example, when you open a web browser and type ...
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