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HTM is an extension for an HTML (Hypertext Markup Language) file, which is a markup language for creating Web pages. HTML defines how a Web browser displays every browser page element, including pictures, text, hyperlinks and many others.
Sometimes you'll see an HTML file as ".html," but it is more frequent to see the 3 letter file extension of ".htm" used.
File extensions, such as htm, are almost always three letters and usually lower case. Other common extensions include the following the file called example:
The extensions may be derived from the file's function, creator, company or some other associated word or action.