It accomplishes this by introducing a new type of APK (Android Package) known as archived APKs. These are the guts of an app that make it usable on your device. As Google notes, archived APKs are significantly smaller and retain all your data until you restore them to their original size. The capability will be accessible to developers with the Bundletool 1.10 release, but will not be usable until “later in the year” when Google makes it available to the general public. Additionally, developers can opt out of archived APKs, which Google discusses in the blog post.
