Some Commonly Used File Types
Purpose Creation Extensions Viewing
Simple ASCII Text documents Any editor .txt Any browser
Rich Text Format (rtf) Most word processors (save as rtf). .rtf Any browser
Word Processing (proprietary formats) Microsoft Word, Corel WordPerfect, StarOffice, etc. .doc, .wpd... Browser invokes word processor
Hypertext Markup Language Any editor .html, .htm, ... Any browser
Still photographs  Scanners, digital cameras, clip art, etc.  .gif, .jpeg, .jpg, .tif, .bmp, ... Any browser can display .gif and .jpg files
Simple Animations Corel, StarOffice, Microsoft, etc. .gif Any browser
Sounds Real, Microsoft, etc. .rm, .rma, .mpg, .mp3, .au, .avi, ... Browser invokes plug-in
Moving Images (with Sound) Real, Shockwave, Quicktime, Microsoft Audio-Video Interleave, etc.  .rm, .rma, .mpg, .avi, swf, ... Browser invokes plug-in
Portable Document File Adobe Acrobat .pdf Browser invokes plug-in

A "browser" is an applications program which is used to assemble the pictures, text, and sounds which comprise a "Web page". It is a "client" program which requests files from a "server" program on another computer, using one or more of the communications rules or "protocols" described in the document on this site called "What is a URL?"

Copyright © Christopher Brown-Syed 1995-2001. Disclaimers.