Differential gears are mechanical devices used in vehicles to allow the wheels to rotate at different speeds, especially when turning. This is important because the outer wheels travel a longer distance than the inner wheels during a turn. The differential ensures that power is distributed evenly to each wheel while accommodating these differences in speed. Typically found in the drivetrain of vehicles, a differential consists of a set of gears that work together to manage torque and speed. It is a crucial component in systems like automobiles and bicycles, enhancing stability and control while improving overall handling.