Trekking involves walking for extended periods, usually multiple days, to explore scenery. It can be challenging and requires difficult journeys, often on foot. Examples of famous treks listed include routes in Switzerland, England, and Nepal lasting 9-23 days. Trekking varies in difficulty from easy for beginners to strenuous requiring experience. Proper equipment like clothing, cooking supplies, first aid kits, and maps are needed. Safety precautions should be taken before, during, and after trekking. Health benefits include exercise, culture, and time in nature. Trekking differs from hiking in duration and planning, and from climbing in using legs over hands and not being a climbing sport.