How can current versions of Adobe products continue to run on the new Macs with Apple Silicon?

During its November 10, 2020 event, Apple has announced that [Adobe is bringing its major apps to Apple Silicon, starting with the Lightroom photography software](https://appleinsider.com/articles/20/11/10/adobe-bringing-lightroom-to-apple-silicon-in-december) . They also said that all current versions will continue to run, but the new ones will take advantage of Apple Silicon directly. How can it be the current versions will run on the new ARM processor, since they were compiled for x86 Intel processors?