Read this for the most complete and comprehensive answer on the matter.
TL;DR: Like Fedora Atomic, it utilizes OCI images for its immutability. However, while Fedora Atomic combines this with libostree/OSTree for git-like management of your system, Vanilla OS (instead) keeps it relatively simple with just A/B partioning; which indeed is somewhat reminiscent to what’s found on Android.
Read this for the most complete and comprehensive answer on the matter.
TL;DR: Like Fedora Atomic, it utilizes OCI images for its immutability. However, while Fedora Atomic combines this with libostree/OSTree for git-like management of your system, Vanilla OS (instead) keeps it relatively simple with just A/B partioning; which indeed is somewhat reminiscent to what’s found on Android.