An amphibious all-terrain vehicle (AATV) is a small off-road, and typically six-wheel drive, amphibious vehicle. They were developed in the early 1960s and quickly became popular in both the United States and Canada. These vehicles are now used by enthusiasts and professionals worldwide for recreation and industry. These vehicles earned their own classification – all-terrain vehicle (ATV). However, after the introduction of small three- and four-wheeled off-road motorcycles in the 1970s and 1980s, the nomenclature ATV more commonly refers to the non-amphibious all-terrain vehicles.