One of the extraordinary aspects of the Web is its "multimedia" quality. While text has been traveling over the Internet for years, it is only recently that we can send audio files, video files and graphics. File Extensions
You can identify what type of file you will be getting by looking at the last part of the URL.
Here are some common types of file formats:
.txt Text file .html .htm HyperText Markup Language document info .gif Most common format for graphical info .jpg .jpeg Another graphics file format .wav Sound file format .au Sound format .mov .qt Quick Time Movie file .zip Compressed files Adobe Acrobat format .avi Movie Files .exe Program Files .ra Real Audio sound file If the URL ends in .gif, you expect to see graphical information. If the URL ends in .au, you expect a sound file, and if the URL ends in .html or .htm, you expect to see a HyperText document with its hyperlinks.
