What is EDR?
EDR, for Endpoint Detection and Response, is a category of security tools deployed on endpoints (workstations, servers, laptops). It continuously collects data on what happens there (processes, connections, file changes) and analyzes it to detect signs of an attack.
Its value rests on three combined capabilities: detection, based on behavior rather than mere signatures; investigation, which lets you reconstruct how an attack unfolded; and response, which lets you act, for example isolating a compromised endpoint from the network.
Why it matters for your organization
Modern attacks bypass classic antivirus, notably through living-off-the-land techniques that use no malware. EDR meets this reality by focusing on behavior: an abnormal sequence of actions becomes detectable even without a suspicious file.
It also shortens reaction time. In an intrusion, the ability to quickly isolate a machine and understand what happened is the difference between a contained incident and a widespread compromise.
What an EDR provides
- Behavioral detection of threats, including unknown ones.
- Continuous visibility into endpoint activity.
- Investigation and reconstruction of how an attack unfolded.
- Response: isolation, blocking, remote remediation.
- ATT&CK mapping of the techniques observed.
Where organizations most often fall short
The most common pitfall is deploying an EDR then leaving it on autopilot, with no team to handle the alerts: a tool that detects but that nobody acts on does not protect. The other mistake is forgetting that the EDR itself can be targeted or disabled by an attacker, hence the importance of protecting and monitoring the security tool as a critical asset.