We add hatching in AutoCAD to fill an enclosed area with a pattern, solid fill or gradient. Use hatch to represent materials, to detail sections (differentiate parts) or to show different zones.
The Hatch command was massively overhauled by Autodesk in AutoCAD 2011, making it very interactive via the ribbon. Some like it the instant results; some don't care for the sometimes unpredictable ...
In order to hatch in AutoCAD you need to draw objects forming a closed area. Beginning with AutoCAD 2005, it became acceptable to hatch an area with a small opening. AutoCAD comes with a good number ...