What is SIEM and how does it help security teams?

Short answer

SIEM aggregates log data from across the environment, correlates events, detects anomalies, and provides dashboards and alerts for security operations.

How it works

SIEM platforms collect logs from firewalls, endpoints, servers, and cloud services. They normalize data formats, apply correlation rules, and use machine learning to identify patterns indicative of attacks. Alerts are prioritized and presented to analysts in a centralized console.

Example

A SIEM correlates a failed VPN login from a foreign IP with an endpoint malware alert and a privilege escalation event on the same account. The combined story triggers a high-priority incident for investigation.

Why it matters

Manual log review is impossible at scale. SIEM automates threat detection, accelerates incident response, and generates compliance reports required by auditors and regulators.