Digital Forensics and Incident Response (DFIR) combines the investigative discipline of digital forensics with the operational practice of incident response to detect, analyze, contain, and remediate cybersecurity incidents. Digital forensics focuses on the collection, preservation, and examination of digital evidence—from endpoints, servers, cloud environments, mobile devices, and network traffic—in a forensically sound manner that maintains chain of custody. Incident response applies that evidence to understand how an attack unfolded, scope the compromise, eradicate the threat, and restore normal operations. Core capabilities include forensic image acquisition, memory and disk analysis, malware reverse engineering, log and timeline reconstruction, threat actor attribution, and root-cause analysis. DFIR teams are engaged during active breaches, suspected compromises, insider-threat investigations, and litigation or regulatory matters requiring defensible evidence. Deliverables typically include detailed investigation reports, indicators of compromise, containment and remediation guidance, and expert testimony where legal proceedings are involved. Many providers offer incident response retainers that guarantee rapid access to certified examiners. By pairing rigorous evidence handling with fast operational response, DFIR helps organizations resolve incidents while satisfying legal, regulatory, and insurance requirements.