Motorcycles are 2 wheeled vehicles powered by an internal combustion engine generally made for a single rider.  Although there are many styles of motorcycles, they are loosely organized into 6 main categories.  These categories most closely align to the intended use of the vehicle.  There is your standard motorcycle, your more relaxed cruising motorcycle, the larger capacity and longer haul touring cycle, a racing more sportier sports cycle and then you have a off-road motorcycle often known as a dirtbike and lastly a dual-sport which is a motorcycle that can go both on and offroad.