Digital Elevation Model (DEM) is a three-dimensional representation of cartographic information in a raster form. DEM represents Earth's terrain's surface. In this map, you can see that it is split up in a grid, and each of the cell has a value corresponding to an elevation. If you click on the site I have linked above, you can click on any cell you'd like to zoom in and observe a more detailed map of the elevations corresponding to the legend. The rainbow scale show that white outline coasts, state, country, gray is county outlines, black represents rivers, red is highways, light red is interstate and magenta stands for national parks. A few common uses of DEM are to extract terrain parameters, create relief maps, and surface analysis.
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