Pseudonymization is a data management and de-identification procedure by which personally identifiable information fields within a data record are replaced by one or more artificial identifiers, or pseudonyms. Pseudonymization is suggested as one of the technical measures that can help with compliance with the European Union's General Data Protection Regulation and its obligations for data controllers to ensure secure processing of personal data.

Source: Rec. 26, Article 4.1.5. of the General Data Protection Regulation L 119/1, 4.5.2016