Planet gears are a type of gear used in mechanical systems, particularly in gearboxes. They consist of a central gear called the sun gear, surrounded by multiple smaller gears known as planet gears. These planet gears rotate around the sun gear while also spinning on their own axes, allowing for efficient power transmission and torque multiplication. In a typical arrangement, the planet gears are mounted on a movable arm called a planet carrier. This design enables the gears to distribute load evenly, reducing wear and increasing the lifespan of the components. Planet gears are commonly found in applications like automobile transmissions and industrial machinery.