All About the Internet.

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Presentation transcript:

All About the Internet

The Internet The Internet is a global network of networks. People and organizations connect into the Internet so they can access its massive store of shared information. The Internet is open to everyone. Anybody can publish information or create new services. The Internet is based on everyone co-operating. No-one owns it or is in charge of it.

History of the Internet The Internet, a set of rules allowing computers to communicate with each other was invented in 1969 by the US Defense Advance Research Agency. The World Wide Web was invented by Sir Tim Berners-Lee in 1990. He created the first html web site while working at CERN. The World Wide Web is a graphical interface allowing you to see text, photos and graphics, hear sounds and view videos by clicking on a hyperlink. You can click here to see the first ever web directory made by Berners-Lee.

How Big is the Internet? According to the US Census department, in 2008 190,646,000 people living in America had access to the internet at home or at work. According to Domain Tools there were 233 million operational websites in April 2010. Cisco says global internet traffic will reach 44 exabytes per month in 2012. An exabyte is a billion gigabytes. A gigabyte is 1,000,000,000 bytes. In 2008 Google announced it had discovered one trillion unique URLS.

What is a Web Page? A web page is a document on the World Wide Web. A web site is a collection of web pages. A web browser is the computer program you use to retrieve and view web pages. The most popular browsers are Microsoft’s Internet Explorer, Mozilla’s Firefox, Google’s Chrome and Apple’s Safari. The starting point for a web site sometimes is called a home page.

What is a Search Engine? Search engines are programs that search the world wide web for information. Search engines ‘crawl’ the website for information which they ‘index’ using the meta tags in a web site. Users enter a query into a search engine using key words, the search engine uses its index to find the best matching information. Examples of search engines are Bing, Google, Yahoo and Ask. Metasearch engines send information requests to more than one search engine. Examples are Dogpile, SurfWax and Copernic Agent.