Guides for many different disciplines and activities including high mountaineering also known as alpinism. Activities in the the mid altitude mountains below the glaciers, include trekking and hiking with guiding from Mountain Leaders, rock climbing usually in the lower valleys with instructs, via ferrata with guides and instructors and canyoning deep in the ravines of the valleys, with it guides and instructions.
The reality is that the highly qualified High Mountain Guides will provide guiding and instruction for most, if not all of these activities, but also all the mid and lower mountain activities have their own specialised guides and instructors.