Technique for making sensitive data usable in non-production contexts while preserving volume, quality, shape and relationships. Contrasted in the talk with two other techniques: encryption (data unreadable, breaks UI) and tokenization (reversible mapping, still ugly). Obfuscation is preferred because it produces realistic-looking data (e.g. US phone numbers stay US phone numbers, Arabic names stay Arabic names) without traceability back to real individuals. Benefits: HIPAA-compliant staging/integration envs, BI and analytics, load testing with real volumes, and UX/design walkthroughs that feel realistic.