An IMU (Inertial Measurement Unit) is a device that measures and reports a body's specific force, angular rate, and sometimes magnetic field. It typically consists of accelerometers, gyroscopes, and sometimes magnetometers, which work together to provide data about motion and orientation. IMUs are widely used in various applications, including robotics, aerospace, and smartphones. IMUs play a crucial role in navigation systems, helping to determine position and movement without relying on external references. They are essential in technologies like drones, self-driving cars, and virtual reality systems, where accurate motion tracking is vital for performance and safety.