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Apple announced that it would be moving from Intel processors to Arm-based Apple Silicon CPUs for Macs at WWDC 2020.
The Apple Silicon-based Mac Book Air and Pro were released in October 2020 with great fanfare.
One of the issues that arise with the CPU transition is application compatibility.
Since Apple Silicon is an Arm-based processor, applications built for Intel-based Macs will no longer work.
To solve this problem, Apple offers the following two technologies:
Universal Binary 2
Rosetta 2
Universal Binary 2 is a mechanism to encapsulate binaries built for multiple architectures into a single binary, which is also called Fat Binary.
Apple has been using this technology for a long time to maintain backward compatibility.