An Inertial Measurement Unit (IMU) is an electronic device that measures and reports a body's specific force, angular rate, and sometimes magnetic field. It typically uses a combination of accelerometers, gyroscopes, and sometimes magnetometers to track orientation, velocity, and movement in three-dimensional space. In cybersecurity contexts, IMUs can be found in mobile devices, drones, and IoT hardware, where they help detect unauthorized movement, support secure authentication, or trigger alarms if tampered with. Their data can be used to enhance security measures, such as ensuring a device has not been physically compromised or moved unexpectedly.