Some definitions of terms in the Data Protection Act:

TERM USED

DEFINITION

Data Information that is either computerised, or it forms part of a manual record (for example a paper-based file or microfiche record.)
Personal Data Data which relate to a living individual, including expressions of opinion.
Processing A range of activities from collection to destruction, including the mere holding of personal data.
Data Subject An individual who is the subject of personal data.
Data Controller Was called "Data User." Whoever determines the purpose(s) for which data are to be processed.
Data Processor Any person, other than an employee of the Data Controller, that processes data on behalf of a Controller.
Data Protection Commissioner Was called "Data Protection Registrar." An appointed official responsible for enforcing the Data Protection Act.
Notification Was called "Registration." A register is maintained by the Commissioner containing details of Data Controllers' processing activities.