Data access is an academic concept and methodological domain concerned with the principles, mechanisms, and governance structures that enable the retrieval, sharing, and utilization of information resources. As a research field, it investigates the policies, technologies, ethical considerations, and legal frameworks surrounding the legitimate and effective acquisition and use of data, encompassing aspects such as permissions, security, privacy, and interoperability. Its significance lies in facilitating research, enabling evidence-based decision-making, and driving innovation by ensuring necessary data is available under appropriate conditions.