Audit data is a category of structured or unstructured information generated by systems or processes, specifically intended for collection and analysis to verify operations, assess compliance, or monitor security. This data, encompassing logs, transaction records, system events, and user activities, serves as the empirical basis for audits across various domains. As a research concept, it involves the study of its generation, capture, storage, integrity, and the development of analytical methodologies (e.g., data mining, forensic analysis, anomaly detection) for identifying patterns, deviations, or evidence relevant to assessing accuracy, adherence to policies, or detecting suspicious activities, thereby contributing to assurance, governance, and security research.