Apple File System (APFS)

is a proprietary file system developed and deployed by Apple Inc. for macOS Sierra (10.12.4) and later, iOS 10.3, tvOS 10.2, watchOS 3.2, and all versions of iPadOS
it aims to fix core problems of HFS+ (also called Mac OS Extended)
is optimized for solid-state drive storage and supports encryption, snapshots, and increased data integrity, among other capabilities