Quoted By:
Mountaineering -> higher altitude and more technical, needs extra gear and sometimes a rope. It's in the middle of hiking and climbing. Often, there is snow and ice as well.
While hiking is any outdoor uphill walk towards a summit, even hills and short mountains with low inclination. It isn't as demanding and you don't need as much gear - often, a small backpack with some water and food is enough and boots aren't necessary.
