Gao Xiang gave an overview of the Extended Read-Only File
System (EROFS) in a filesystem session at the
2023 Linux Storage, Filesystem,
Memory-Management and BPF Summit. EROFS was added
to Linux 5.4 in 2019 and has been increasingly used in
places beyond its roots as a filesystem for Android and embedded devices.
Container images
based on EROFS are being used in many places these days, for example.

Source: LWN.net – [$] An introduction to EROFS