Ab-gota.zip -

The most interesting feature regarding this file format is its capability:

If the update in partition B fails to boot or is buggy, the system automatically reverts to partition A. This prevents the device from becoming "bricked" during a failed update process. AB-GOTA.zip

Modern "Virtual A/B" updates (common in Android 11+) use compressed snapshots. Instead of needing double the physical storage, the AB-GOTA.zip package only writes the differences (diffs) to the storage, significantly reducing the disk space required for the update. The most interesting feature regarding this file format