What is XDR (Extended Detection and Response)?

XDR extends endpoint detection across every layer of your environment — network, cloud, identity, and email.

Extended Detection and Response (XDR) is an evolution of EDR that integrates telemetry from multiple security data sources — endpoints, network, cloud workloads, identity systems, and email — into a unified detection and response platform. Where EDR sees only what happens on individual endpoints, XDR correlates activity across the entire environment to surface attack patterns that span multiple systems.

The value of XDR is correlation. An attacker who logs in via compromised credentials (identity), downloads a tool from an external server (network), runs a script on an endpoint (endpoint), and stages data in a cloud storage bucket (cloud) generates four separate alerts across four separate tools. Without correlation, each alert looks like a minor anomaly. With XDR correlation, the pattern reveals a data exfiltration campaign in progress.

XDR data sources

• Endpoints: process execution, file activity, network connections (EDR telemetry)
• Network: east-west and north-south traffic analysis, DNS queries, firewall logs
• Identity: authentication logs, privileged access usage, anomalous login patterns
• Cloud: workload activity, storage access, API calls, configuration changes
• Email: phishing detection, attachment analysis, link analysis, BEC indicators

XDR vs. SIEM

SIEM (Security Information and Event Management) also aggregates logs from multiple sources. The key differences: XDR is built for detection and response with native integrations and pre-built correlations; SIEM is primarily a log management and compliance tool that requires significant custom rule development to generate actionable detections. XDR is typically more immediately usable; SIEM provides more flexibility for custom use cases but requires significant analyst time to tune and operate.