An image map lets you define clickable regions on a single image — different areas link to different destinations. Think of a world map where clicking each country goes to a different page. They're created using the <map> element with <area> children, and linked to an image via the usemap attribute.
1-A 2-A 3-A 4-A | 5 mapname 6 area 7 = <map name="m"><area shape="rect" coords="0,0,100,50" href="a.html" alt="A"></map> 8 = Diagrams/maps where regions link to different pages 9 = Not responsive by default; CSS/SVG alternatives are better | 10 = Any polygon via multiple coordinate pairs