Endpoint Detection and Response (EDR): What It Is and Why You Need It

Traditional antivirus uses signature-based detection — it compares files to a database of known malware. EDR (Endpoint Detection and Response) goes further: it monitors device behavior continuously, detects suspicious activity even from new/unknown threats (zero-day attacks), and enables investigation and response. How EDR works: a lightweight agent on each endpoint records process activity, file changes, network connections, and registry modifications. The cloud-based platform correlates this data using ML and threat intelligence to detect attacks in progress. When a threat is detected, security teams can investigate the full attack chain and remotely isolate/remediate the endpoint. Leading EDR solutions for SMB: Microsoft Defender for Endpoint (P1 or P2, included in Microsoft 365 Business Premium), CrowdStrike Falcon Go/Pro, SentinelOne Singularity. For most small businesses, Microsoft Defender for Endpoint included in their existing 365 license is the practical starting point. Review the alerts dashboard weekly — EDR generates valuable intelligence about threats targeting your environment.