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This is the 3 or 4 letter suffix at the end of any filename. For instance, this page is called glossary.html, with the .html bit being the extension. It tells the computer what type of file it is and therefore, what program to use to open it. You can learn how to save as a .html file, see a list of commonly-met file formats on the Internet, or check out the web’s most popular image formats.
