Apple File System
developer.apple.com/library/prerelease/content/documentation/FileManagement/Conceptual/APFS_Guide/GeneralCharacteristics/GeneralCharacteristics.html#//apple_ref/doc/uid/TP40016999-CH2-SW1
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
Apple File System is a Next-Generation File System for Apple ProductsHFS+ and it