Within 2016 WWDC Apple announced a new file system APFS (Apple File System). She comes to replace HFS+, introduced in 2001.
New file system Apple developed from the ground up with an eye on solid state drives and other storage devices based on flash memory, and data encryption. The system is scalable and can be used on all devices, from smart hours on the platform watchOS, ending with the Mac Pro.
Apple describes APFS:
Apple File System is a new modern file system for iOS, macOS, …