Hiking is an outdoor activity of walking in natural environments often on pre charted paths called hiking trails, while trekking is a long journey on non-designated paths which could last several days and could be demanding. Trekking usually takes places in the area of great natural beauty, usually in the mountain areas without any means of transport. It is more intense than hiking.
Hiking is an initial part of trekking and relatively easier than trekking, which still involves going uphill and downhill on rural hilly areas below 3000 meters. Hiking in Nepal still offer a glimpse of high mountains views, while trekking takes you through the low land village to high Mountain pass up to almost 5,600 meters.