macOS High Sierra
macOS 10.13 High Sierra is the fourteenth version of macOS, and the follow up to macOS Sierra. Much like how OS X Snow Leopard was a refinement of OS X Leopard, macOS High Sierra is highly focused on refining macOS Sierra.
Yet the release does add some brand new features to the table. Noteworthy additions include external GPU support, which provides compatibility with VR headsets for the very first time, and Apple File System (APFS), which replaces the previous HFS+ file system.