DevOps Dictionary

SIEM (Security Information and Event Management) is a platform that centralizes security-relevant logs and events from across your infrastructure, applications, and cloud services, then correlates and analyzes them to surface suspicious activity. It addresses the problem of scattered telemetry and alert fatigue by normalizing data into a common format, applying rules and analytics to detect patterns (for example, unusual login behavior across multiple systems), and generating prioritized alerts and investigation context so responders can act quickly.

With SIEM, teams get faster detection and more consistent incident response because signals are aggregated and evaluated in one place; without it, threats are easier to miss and response tends to be slower and riskier due to manual log hunting and disconnected alerts. This gap exists because attackers often leave small traces across many systems, and SIEM is designed to connect those traces into a coherent timeline.