What do you mean by terrain?

1, topography, refers to the undulating surface morphology and steep conditions. Include the absolute height and relative height difference or slope of the surface morphology.

Generally speaking, topography is a geographical term used to describe the topography of the earth. Different terrains are often formed by the combination of internal and external dynamics under different conditions. The utilization of terrain by human beings is manifested in many aspects such as engineering water conservancy, architecture and military affairs.