The UEFI Development Kit (UDK) is a stable release of portions ofEDK II. UDK releases are tested against Intel architecture platforms, and omits components that cannot be validated on those configurations.

Note: EDK II has moved to a 'stable tag' release format, which occurs every three months. Info on UDK is presented for historical purposes.

EDK II is the open source project for which volunteers participate in development. The tip of this project is constantly updated for fixes and enhancements.

UDK releases represent a fully validated implementation of a specific revision ofEDK II source, tested against Intel Architecture platforms. A UDK release is a subset of available EDK II packages, since not all packages can be validated on Intel platforms. Each UDK release lists the corresponding EDK II version in the release notes. Each release is available as a ZIP file, and is mapped to a branch of the EDK II github project (example:https://github.com/tianocore/edk2/tree/UDK2017 forUDK2017).