A practitioner's primer on the structural design of India's first comprehensive data-protection statute — lawful basis, data-fiduciary obligations, the Significant Data Fiduciary tier, data-principal rights, cross-border transfers, exemptions, the Data Protection Board, the Schedule's ₹250 crore penalty cap, and the staged repeal of Section 43A IT Act and the SPDI Rules 2011. Written as the foundational reference for any DPDP question.