Security
SIEM
Also known as: Security Information and Event Management
Collects and correlates log data from across your environment — servers, firewalls, endpoints, cloud — to detect threats and anomalies.
A SIEM — Security Information and Event Management — collects log data from across your entire environment (servers, firewalls, endpoints, cloud services) and correlates it to detect threats and anomalies.
The value is in aggregation. A single failed login attempt isn't interesting. A thousand failed login attempts against one account at 3 AM from an IP in a country where you have no employees — that's a pattern worth acting on. A SIEM catches it.
Modern SIEMs combine rule-based alerting (triggers you configure) with machine learning (baseline normal behavior, alert on deviations). The ongoing tuning is what makes them useful — raw SIEM data produces enormous noise, and turning it into actionable signal requires both expertise and time.
For most organizations under 500 employees, a standalone SIEM is probably overkill. The more practical entry point is a managed MDR service that includes SIEM capabilities as part of an end-to-end offering.