A trek is a long, adventurous journey, typically on foot, through scenic or rugged terrain. It involves hiking across natural landscapes such as mountains, forests, valleys, and deserts. Treks are often multi-day excursions that require physical endurance and preparation, and can range from easy walks to challenging high-altitude climbs.

Popular trekking destinations include regions like the Himalayas (Nepal, Bhutan, India), the Andes (South America), and Africa's Kilimanjaro. Trekkers typically follow established routes, often through remote areas, and may pass through villages to experience local cultures and traditions.