Under the European General Data Protection Regulation (GDPR), organisations processing personal data must maintain a record of their processing activities (ROPA) unless an exemption applies.
However, the type of information to maintain in this record differs depending on whether the organisations act as a controller or as a processor with regard to a specific processing activity.
Besides, some of the processing activities recorded may also be subject to a data protection impact assessment (DPIA), which requires additional information (see here).