A live axle is a type of axle that rotates along with the wheels and provides torque to the wheels. There are several synonyms for live axle, including solid axle, fixed axle, and rigid axle. All of these terms refer to an axle that has a fixed connection to the wheels, unlike independent suspension systems where the wheels are free to move independently of the axle. Live axles are commonly found in vehicles such as trucks, SUVs, and off-road vehicles due to their durability and ability to handle heavy loads. They are also used in certain types of machinery and equipment for their strength and stability.