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+, APFS's predecessor, which had been in use since 1998. APFS is optimized for solid-state drive storage and supports encryption, snapshots, and improved handling of metadata integrity.