Strategic Approaches to Threat Detection, Investigation & Response

### Executive Summary: This document provides a concise overview of Threat Detection, Investigation, and Response (TDIR), explaining the roles of detection (visibility and anomaly identification), investigation (context, root cause analysis, event correlation, threat intelligence), and response (containment, remediation, recovery) with illustrative scenarios (phishing, ransomware, supply‑chain, insider threats), recommended tools (SIEM, EDR, XDR, UEBA), and the operational and compliance benefits of adopting a unified TDIR approach.