It has broad definitions and alot of activities can be accorded to it, some scholars identify mountaineering-related activities as climbing (rock and ice) and trekking up mountains, others are also adding backpacking, hiking, skiing etc
Going Mountaineering for a breath of fresh air. Oh, that's nice. So you like climbing mountains? Yes, although it can also be done indoors.
While some scholars identify mountaineering-related activities as climbing (rock and ice) and trekking up mountains, others are also adding backpacking, hiking, skiing, via ferrata and wilderness activities, and still others state that mountaineering activities also include indoor climbing, sport climbing and bouldering.