SIEM and XDR

In practice many organizations deploy both, SIEM for comprehensive logging, compliance and historical analysis and XDR for accelerated detection-to-response workflow. This cuts down the average time to detect and remediate threats.

SIEM - foundation, it gathers and archives every event, making the data available for searchers, investigations and compliance audits. It alerts on ‘what happened’

XDR - defender, alongside or on top of SIEM, leveraging same event data + endpoint and network signals to apply real time analytics and automated containment. It answers ‘what to do next’, sometimes take action itself.

Related: SIEM (Security Information and Event Management)XDR (Extended Detection and Response)