An Audit Log is a record that tracks all activities and changes made within a system or application. It captures important information such as who made the change, what action was taken, and when it occurred. This log is essential for maintaining security and accountability, as it allows organizations to monitor user actions and detect any unauthorized activities. Audit logs are commonly used in various fields, including finance, healthcare, and information technology. They help organizations comply with regulations and standards, such as HIPAA or GDPR, by providing a clear trail of actions that can be reviewed during audits or investigations.