In the era of Agentic AI, data governance is no longer just a compliance checkbox—it is the \'trust layer\' that enables autonomous systems to function without bias or hallucinations. This complete guide explore how modern data governance has evolved from a defensive, manual process to an offensive, AI-powered strategy that drives business value. Learn the 5-step roadmap to operationalizing trust, from strategy alignment to autonomous quality monitoring. We provide deep dives into governance for Banking and Healthcare, explaining critical concepts like data lineage, active metadata, and the EU AI Act. Discover how to move your organization from Level 1 (Reactive) to Level 4 (Optimized) on the Data Governance Maturity Model and turn your data into a secure, high-performing strategic asset