XDR (Extended Detection and Response) — Definition & Context in B2B Laptop Rental

An evolution of EDR that integrates and correlates telemetry from multiple security layers simultaneously: endpoint, network, email, cloud workloads, and identity — to deliver more comprehensive threat visibility than EDR alone. XDR detects multi-vector attacks that might be missed when each security tool operates in isolation. Example: a phishing email (email layer) that successfully plants malware (endpoint layer) which then performs lateral movement over the network (network layer) — XDR correlates all three events into a single incident alert. XDR platforms common in enterprise: Microsoft Sentinel + Defender XDR (native Microsoft stack), Palo Alto Cortex XDR, CrowdStrike Falcon XDR, and Trend Micro Vision One. For clients with a mature SOC, XDR is increasingly replacing traditional SIEM as the primary investigation platform because mean detection time is shorter.