An audit trail is a record of all activities related to the maintenance operations and management of a system or process. It is used to track changes, identify potential problems, and ensure compliance with regulations. An audit trail typically includes a detailed log of all changes made to the system, including who made the changes, when they were made, and why they were made. It also includes a record of all maintenance activities, such as inspections, repairs, and preventive maintenance. Audit trails are essential for ensuring the accuracy and integrity of maintenance operations and management, and can be used to identify and address any issues that arise.