What is Security Information and Event Management (SIEM)?

### Executive summary This blog post provides an overview of Security Information and Event Management (SIEM), describing its primary functions—data collection and aggregation, normalization and log management, event correlation, real-time monitoring and alerting, incident response/orchestration, and compliance reporting—alongside the top benefits (improved threat detection, faster incident response, regulatory support, hybrid visibility, cost efficiency, behavioral analytics, and XDR integration) and practical implementation considerations (when to use standalone SIEM vs MDR, scope/volume planning, and the need for continuous tuning and operational maintenance).