What is an audit trail and how to do I create one?

Исследователь смотрит на пробирку с жидкостью

An audit trail is a series of user identifiers and time stamps that indicate when users accessed and edited a file. The goal of an audit trail is to prevent unauthorized access or data manipulation. Due to the nature of audit trails, personnel are not encouraged to generate their own audit trail, which would be subject to human interference. Computerized, unalterable audit trails are essential to building confidence in data integrity.