A gear system consists of two or more gears that work together to transmit motion and force. Gears are circular objects with teeth that interlock, allowing them to transfer rotational energy from one gear to another. By changing the size and arrangement of the gears, the system can increase or decrease speed and torque, making it useful in various machines. Gear systems are commonly found in everyday devices, such as bicycles, watches, and automobiles. In a bicycle, for example, different gear combinations help the rider adjust to various terrains. Understanding gear systems is essential for designing efficient mechanical devices.