Gears are specially designed gear elements with circular or helical teeth that transmit rotational or linear motion in mechanical systems. These gears, with different tooth profiles and sizes, work in harmony with each other to transmit rotational motion with mechanical advantages such as speed, torque, or change of direction. They are crucial components used in a wide range of applications, from industrial machinery to automotive vehicles and watch mechanisms, enhancing the efficiency and performance of mechanical systems and ensuring their reliable and smooth operation.