An absolute encoder is a type of sensor used to determine the position of a rotating object, such as a motor shaft. Unlike incremental encoders, which only provide information about movement, absolute encoders give a unique position value for each angle of rotation. This means that even if power is lost, the encoder can still report the exact position when it is turned back on. These encoders work by using a series of coded discs or tracks that represent different positions. Each position corresponds to a specific code, allowing for precise tracking of the object's location. Absolute encoders are commonly used in applications like robotics, industrial automation, and CNC machines.