What is ISO 27001?

ISO 27001 is an international standard for managing information security, covering how a company organises and protects personal data. A brand naming it in its privacy policy is telling you the organisation has a certified system in place rather than a promise alone. Shaadi.com lists it alongside its data practices: Data not sold; stored in India and US; ISO 27001. In this group it is the only privacy fact on record, so for other brands you will need to read their own policy to see what they say. Certification covers process, not the content of your profile.