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Image Map
Image maps are comprised of multiple elements inside of Web pages, one or several of which contain “hotspots”. For example, when a user runs her mouse over a hotspot area, the appearance of the image will change (e.g. color or change to a different image).
An image map is made up of 3 key components: image map data, an image and what’s called an HTML host entry. The image is simply a conventional image stored as a GIF or JPEG file. Map data describes the coordinates of the mapped regions contained within the image itself. The host entry is just HTML commands that position the image within the Web page according to the map coordinates.
Image maps are designed to function on either the client-side or the server-side.
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