A motorcycle (also called a motorbicycle, motorbike, bike, or cycle) is a single-track,two-wheeled motor vehicle powered by an engine. Motorcycles vary considerably depending on the task for which they are designed, such as long distance travel, navigating congested urban traffic, cruising, sport and racing, or off-road conditions. Being the most affordable form of motorised transport, in some parts of the world they are also the most widespread (e.g., Vietnam).