An entity processing personal data on behalf of a controller, governed by a written DPA (GDPR Art. 28).
A data processor is a natural or legal person, public authority, agency, or other body that processes personal data on behalf of a controller, under documented instructions and a contract meeting GDPR Art. 28 requirements.
Run a free ComplianceIQ audit against GDPR and we'll surface every gap on this — and the other controls auditors flag — with the exact clause references to fix.