Access monitoring is the practice of watching authentication and authorization activity for signs of misuse. Security teams track logins, failed sign-in attempts, new device or location access, privilege changes, session creation, and unusual account behavior. The goal is to spot activity that does not match normal user patterns or expected administrator actions.
It matters because many attacks begin with valid credentials rather than obvious malware. If an attacker steals a password, hijacks a session, or abuses a trusted account, the activity can look legitimate unless access logs are reviewed. Good monitoring helps defenders detect impossible travel, repeated brute-force attempts, suspicious password resets, and unexpected changes to MFA or recovery settings. In investigations, these records also help reconstruct what happened, which accounts were touched, and whether access spread to other systems. Access monitoring is strongest when combined with alerts, log retention, and clear baselines for normal user behavior.