Trekking is a method of taking a break from the daily routine through some good hard work. Trekking can be a wonderful and, at the same time, an exhausting experience. To go trekking, it requires some stamina and the spirit of adventure along with a light bag containing some food, a water bottle and a camera.
A typical trekking day starts easily at 6 in the morning. There is always a trekking guide who instructs his group about the direction to follow and precautions to be taken. The trekkers get to see beautiful landscape on their way. By the end of the day the trekkers are completely exhausted, but not at all stressed.
Below Trekking info from Wikipedia (Read More):-
The word trek has entered the English language as one of few words derived from Afrikaans. It means a long, hard journey, and is derived from the Dutch trekken (meaning to pull or haul).
Hiking is an outdoor activity which consists of walking in natural environments, often on hiking trails. It is such a popular activity that there are numerous hiking organizations worldwide. The health benefits of different types of hiking have been confirmed in studies.[1] The word hiking is understood in all English-speaking countries, but there are differences in usage.
http://en.wikipedia.org/wiki/Trekking