Introduction

The Internet is a global collection of more than a billion computers (and growing) linked together to share information. The Internet’s physical structure includes telephone lines, cables, satellites, and other telecommunications media. Using the Internet, computer users can share many types of information, including text, graphics, sounds, videos, and computer programs. The World Wide Web (also known as the Web) is a part of the Internet that consists of Web sites located on different computers around the world.

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