The elevation above sea level at a given point on your map is represented by the contour lines, whereas the difference in elevation between two points on a map represents the relief.
What are Contour Lines?
Contour lines are curved, straight, or a mixture of both on a map describing the intersection of a real or hypothetical surface with one or more horizontal plans.
Thus, the basic difference between contour lines and relief is that contour lines show the elevation above sea level at a given point on the map, whereas relief shows the difference between two points on a map.
Learn more about Contour lines here:
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