A slope is a slope of the land and the inclination, with respect to the horizontal, of a slope.

The modeling processes of the slopes depend on their inclination and a limit slope (of about 45°, although variable depending on the nature of the rock), from which the friction forces that retain loose materials on the slopes are overcome. Generally there is a more or less abrupt change in slope between the slope and the slope "Slope (geology)") of debris that forms at its base; The limit slope of this slope is usually about 35°. After a long modeling process, a slope may have an equilibrium slope whose inclination will no longer change significantly as long as the same climatic and biological conditions last.

The measurement of a slope is often expressed as a percentage of the tangent. It is used to express the inclination of, for example, a road on an elevation of land, where zero indicates that it is "level" (with respect to the horizontal) while ascending correlative figures designate steeper inclinations. There are three numbering systems:

In vehicle engineering, various landform-based designs (cars, utility vehicles, trucks, trains, etc.) are rated for their ability to climb terrain.