A gear is a mechanical component with teeth that mesh with another gear or a toothed component to transmit torque and motion. Gears are commonly used in machinery, automotive systems, industrial equipment, and robotics to control speed, direction, and power transmission. They come in various types, including spur gears, helical gears, bevel gears, and worm gears, each designed for specific applications. Made from materials such as steel, brass, plastic, or aluminum, gears must be precisely manufactured to ensure smooth operation and efficiency. The size, shape, and number of teeth determine how gears interact and influence performance factors like speed reduction, torque amplification, and mechanical advantage. Proper lubrication and maintenance are essential for preventing wear and extending the lifespan of gears. Due to their versatility and reliability, gears play a crucial role in countless mechanical systems, enabling the efficient transfer of motion and force.