Incident response (IR) is the structured approach organizations use to detect, contain, eradicate, and recover from cybersecurity incidents while minimizing damage and restoring normal operations. It's a critical security discipline that sits at the intersection of proactive defense and reactive remediation, bridging threat detection with business continuity. The core challenge is not just responding to attacks, but doing so fast enough and thoroughly enough that attackers cannot achieve their objectives — this requires pre-planned procedures, trained teams, and continuous improvement based on post-incident analysis. The most effective incident response programs treat every incident as both a crisis to manage and a learning opportunity to strengthen defenses.