Bevel gears are mechanical components used to transmit power between shafts that are typically at right angles to each other. They have conical shapes, allowing them to change the direction of rotation efficiently. These gears come in various types, including straight bevel gears, spiral bevel gears, and hypoid gears, each designed for specific applications and load requirements. The primary advantage of bevel gears is their ability to handle high torque and speed while maintaining smooth operation. They are commonly found in automobiles, industrial machinery, and hand tools, making them essential for many mechanical systems that require directional changes in motion.