ISO 27701 privacy information management is the answer to a problem every privacy team eventually hits: data protection law tells you what outcome is required and gives you no certifiable way to prove you achieve it. There is no GDPR certificate. ISO 27701 is the closest thing to one.
It extends ISO 27001:2022 into a privacy information management system, the same governance machinery of scope, risk, objectives, internal audit and management review, applied to personal data, with additional guidance for organisations acting as controllers and for those acting as processors. The mapping annexes to GDPR and other regimes are what make it commercially useful.
In practice it turns privacy from a legal position into an operating system: records of processing that stay current, privacy impact assessments that happen before launch, data subject rights served on a clock, and evidence produced continuously. It sits directly alongside GDPR and DPDP Act programmes rather than replacing them.