The only difference is the file extension of the linked file. Keep in mind your intended audience and their access to software. Most UNIX workstations, for instance, cannot view QuickTime movies. MAP specifies the regions of a mapped image and the associated URLs. This allows you to assign different links to different parts of a single image rather than only one link to the entire image.
All coordinates are in pixels .
Client-side image maps are simple to create with the assistance of a map coordinate program. The program does the rest and inserts the map coordinates in your HTML document.