Heliskiing is off-trail, downhill skiing or snowboarding that is accessed by a helicopter, as opposed to a ski lift. Most heliskiers are seeking specific, pleasurable skiing conditions that are hard to replicate in the highly manipulated terrain of ski resorts: particularly powder snow, but also long descents, natural terrain contours and features, smooth corn snow, old-growth tree glades, and steep slopes.

The presence of the guide and aircraft offers protection against the risks and discomforts unavoidably associated with entering this mountainous environment, allowing skiers with little or no mountain sense to enjoy a natural environment.