The Audit Log is a helpful tool used to track changes and updates on an individual record. Throughlooking at the audit log, you can see what was changed, the date it was changed, and the user who made the change.
This is a great tool to try and troubleshoot a specific record or just see general information on changes affecting it. It can also be helpful to diagnose issues with data integrity.
Please note that, while most records in the database do have an Audit Log, not all of them do. Additionally, most changes to a record are tracked here, but some of the changes made through back-end processes do not appear in audit logs.