Question

hachuring and Hill shading difference

Answer 1

Hachures /ˈhæʃʊərz/ are an older mode of representing relief. They show orientation of slope, and by their thickness and overall density they provide a general sense of steepness
Hillshading is a shaded relief (levels of gray) on a map, just to indicate relative slopes, mountain ridges, not absolute height. Nothing OSM-specific here, yet. See also: Relief maps (contours, colouring and shading) are a more general type of map.

Answer 2

Answer:

Hachures /ˈhæʃʊərz/ are an older mode of representing relief. They show orientation of slope, and by their thickness and overall density they provide a general sense of steepness

Hillshading is a shaded relief (levels of gray) on a map, just to indicate relative slopes, mountain ridges, not absolute height. Nothing OSM-specific here, yet. See also: Relief maps (contours, colouring and shading) are a more general type of map.