What tag is used to define an image map in HTML?

The tag used to define an image map in HTML is the <map> tag. This tag acts as a container for the area definitions that correspond to the different clickable regions on an image. An image map is useful for creating interactive graphics with specified clickable areas that can lead to different links.

While the <area> tag is used to specify each clickable region within the map, it must be used in conjunction with the <map> tag, which defines the overall image map itself. Therefore, while the <map> tag is the primary tag that enables the creation of an image map, it organizes and contains the <area> definitions which actually define the clickable areas over the image.

The options that mention "Image Map Tag" and "Img Tag" are not valid HTML elements related to image maps. "Image Map Tag" does not exist in HTML terminology, and the <img> tag is solely used for embedding images in an HTML document without any mapping functionality.