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Lesson 2Using the Internet:
ObjectiveThis page describes the Structure of the Internet.
Internet defined
Think of the Internet as a giant computer network linking computers from all over the world. Then add millions of users and for some users, the Internet is an infrastructure to access public and private networks, social networks, etc. For other users, it is the essential bridge for the Web and email. Which group do you belong to? Either is correct, as long as users best define the Internet as comprising four essential parts: computers, networks, software, and users.
Essential parts of the Internet
Essential parts of the Internet
The Internet supports a wide range of services that are available to users. Here are the basic Internet services:
  1. Electronic mail (email)
  2. World Wide Web (the Web)
  3. Mailings lists and newsgroups
  4. Chat
  5. File Transfer Protocol (FTP)
  6. Search Engines

World Wide Web
One has millions of Web sites form the enormous resource database called the World Wide Web (the Web). To get onto the Web and find Web sites you will need a browser. Firefox and Microsoft Internet Explorer are the two most popular browsers. You can learn about each at their respective Web sites.
To see how the Internet has evolved, review the history of the Internet.
In the next lesson, the business uses of the Internet, intranets, and extranets will be discussed.
The World Wide Web is an information space where documents and other web resources are identified by URLs, interlinked by hypertext links, and can be accessed via the Internet. It has become known simply as the Web.
The World Wide Web was central to the development of the Information Age and is the primary tool billions of people use to interact on the Internet.
The World Wide Web was invented by English scientist Tim Berners-Lee in 1989. He wrote the first web browser in 1990 while employed at CERN in Switzerland. Web pages are primarily text documents formatted and annotated with Hypertext Markup Language (HTML). In addition to formatted text, web pages may contain images, video, and software components that are rendered in the user's web browser. Embedded hyperlinks permit users to navigate between web pages. Multiple web pages with a common theme, a common domain name, or both, may be called a website. Website content can largely be provided by the publisher, or interactive where users contribute content or the content depends upon the user or their actions. Websites may be mostly informative, primarily for entertainment, or largely for commercial purposes.