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The European Union (EU) has developed a complex architecture of information systems to support its policies on external borders, migration management, and internal security. In response to recent migration and security challenges, the EU has sought to expand and upgrade its existing information systems on borders and security, as well as to establish new systems and to ensure their interconnection (interoperability). The underlying policy goal has been to 'close information gaps' on third-country nationals arriving or staying in the EU, as a means to combat irregular migration and counter security threats more effectively. Whereas the legislative work of updating and expanding EU-wide information systems for borders and security has been rather swift, efforts are still needed to implement changes and to deploy the new information systems. The timeline for this implementation has been revised several times. It is currently envisaged that the new information architecture will become operational between 2024 and 2026. This briefing provides an overview of EU-wide information systems for border management and security. It presents key figures on the operation of the existing information systems and discusses recent policy and technical developments. It also looks at the information systems and the interoperability framework currently under development.