Audit Log
Noun · Security & Infosec
Definitions
An append-only, tamper-evident record of security-relevant events — such as logins, permission changes, and data access — that provides an immutable trail for compliance, forensics, and accountability.
In plain English: A permanent diary of who did what and when in a system, kept so you can go back and investigate if something goes wrong.
Example: "The SOC2 auditor wanted 90 days of audit logs showing who accessed PII and when."