Which principle of GDPR emphasizes limiting data usage to what is necessary?

The principle that emphasizes limiting data usage to what is necessary is Data Minimization. This principle is a core component of the General Data Protection Regulation (GDPR) and it mandates that organizations should only collect and process personal data that is directly relevant and necessary for the specified purpose. This means that, when handling personal information, entities must ensure they are not over-collecting data or retaining information longer than needed. The goal of Data Minimization is to protect individuals' privacy and reduce potential risks associated with excessive data collection, fostering a more responsible approach to data handling.

Other principles, such as Accuracy, focus on ensuring that personal data is kept accurate and up to date, which is also important but does not directly address the limitations on data usage. Confidentiality and Integrity pertain to protecting data from unauthorized access and ensuring it remains unaltered, respectively. Purpose Limitation deals with the requirement that data collected should only be used for the explicit purposes stated at the time of collection. While this is related to limiting usage, Data Minimization specifically addresses the need to limit the amount and scope of data collected in the first place.