Image mapping is when you have series of hotspots applied to a image and when you use your mouse to click on these spots you direct to a page anywhere on the internet via a hyperlink
A hot spot is an invisible region on a graphic to which you have assigned a hyperlink. A text hot spot is a string of text that you have placed on a graphic and assigned a hyperlink. When a site visitor clicks the region or the text, the destination of the hyperlink is displayed in a Web browser. In Microsoft FrontPage, hot spots can be shaped as rectangles , circles , or polygons .
A graphic with one or more hot spots is called an image map. The image map usually gives cues about where you should click.
For example, you have a Web page about your company. On this Web page is a graphic of your product that contains a hot spot for each particular aspect of that product. When the site visitor clicks an area of the product, a page is displayed describing that aspect of the product in detail.
Try it out on the picture above