Web Terminology and Glossary

HTML
Hypertext Markup Language, The Language all web pages are made of, most browsers have a feature to view the HTML of the page by right-clicking and selecting view source. It can be intimidating at first but after a few minutes it is fairly straightforward. a great resorce to learn html is www.w3schools.com
WWW
World Wide Web. Sometimes referred as W3 or as The Web or Internet.
In the past you needed to place WWW before all URLs but today it is not necessary anymore because the browser will put it for you. (the same is with "http://")

For more information on this topic go to http://en.wikipedia.org/wiki/Www this is a detailed history and technical information about the "www protocol"

For SEO information on www vs non-www URLs please search in your favorite engine this phrase www vs non-www

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