Arm64EC allows for the development of native apps or the incremental transition of existing x64 apps to take advantage of the speed and performance offered by Arm-powered devices. This new application binary interface (ABI) for apps running on Arm devices with Windows 11 offers better power consumption, battery life, and accelerated AI & ML workloads. Arm64EC ensures interoperability with x64 code, allowing for code to run with native performance while other code runs under emulation. By recompiling the most CPU-intensive parts as Arm64EC, apps can be improved incrementally without needing to be recompiled all at once. Arm64EC binaries can interact with x64 binaries seamlessly on Windows 11 on Arm, offering a way to make apps faster without requiring a complete overhaul.
https://learn.microsoft.com/en-us/windows/arm/arm64ec