The default file system on the Mac is the Apple File System (APFS), which Windows doesn't natively support. macOS also ...

HFS was introduced in System 2.1 ("System" being what we called "Mac OS" in the days before operating systems gained their broad and ubiquitous sex appeal). HFS improved upon the Macintosh File ...

HFS+ Mac OS Extended (HFS+) was introduced in 1998 for Mac OS 8.1, the previous iteration of the desktop operating system found on Apple’s computers which ran on IBM’s PowerPC processors.

Oddly, Apple allows some parts of Mac OS X system to be themed. The look of the QuickTime Player, for example, can be altered, but only by media with a theme embedded in the QuickTime file.

Note: Apple File System does not directly implement software RAID, however APFS can be combined with an Apple RAID volume to support Striping (RAID 0), Mirroring (RAID 1) and Concatenation (JBOD).