The basic concept of a hypsometric map, like the one shown above, is a surface map that exhibits relief. The third dimension of relief can be shown by color and shaping, contour lines, and raised relief. For most part the third dimension shown in a hypsometric map is topography relief, but there are instances where the map is instead describing a phenomena or process that's being superimposed on the surface. The hypsometric map above represents the the elevation in meters from 0-8000 in 1000 meter bands of the Budhi Gandaki basin. This hypsometric map uses raised relief as well as color and shaping to convey the third dimension of topography.
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