The NATO Digital Backbone Reference Architecture (DBRA) defines the foundational framework for universal connectivity and secure data transport across all operational domains, supporting NATO's transformation into a data-centric Alliance. By integrating diverse data sources, Communication and Information Systems (CIS), and federated services, it ensures digital interoperability and resilience. Governed by the Architecture for Interoperable Digital Technologies (AIDA), the DBRA establishes harmonized principles and standards to enable scalable and secure digital services, including cloud and edge technologies, while minimizing duplications. It provides architectural building blocks for developing interoperable solutions that enhance decision-making, military effectiveness, and collaboration across strategic, operational, and tactical levels.