A word processing file contains user information in plain text or rich text format. A plain text file format contains unformatted text and no font or page settings etc. can be applied. In contrast, a rich text file format allows formatting options such as setting fonts type, styles (bold, italic, underline, etc.), page margins, headings, bullets and numbers, and several other formatting features.
Web file formats define the standards for development of webpages and are related to platform in which these are built. A complete website can be built consisting of static as well as dynamic webpages. Most modern websites are built on server side technology such as Active Server Pages (ASP) that are loaded and run on the web server. These also include cascading styling sheets (CSS) and scripting files used for the styling the overall look and feel of UI.
You can also convert WORD into many other file formats. Please see the complete list below.