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 speed differences. Typically found in the drivetrain of vehicles, differential gears consist of a set of gears that work together to achieve this function. They are crucial for maintaining traction and stability, enhancing the overall performance of vehicles like cars, trucks, and motorcycles.