MacOS High Sierra

macOS High Sierra (version 10.13) is the fourteenth major release of OS X, renamed macOS, Apple's desktop and server operating system for Macintosh computers. It is the successor to macOS Sierra and is a new feature release. Following the California landmark-based naming scheme introduced with OS X Mavericks, High Sierra was named after the High Sierras in the Sierra Nevada mountain range.

The following is a shortened new feature list:
 * New APFS file system, As introduced in iOS 10, replaces the decades-old HFS+ system with a modern replacement
 * HEVC Adds support for a much more efficient H.265 video codec
 * Metal 2 Adds a newer version of the graphics display system, which supports VR and extended GPU functionality at higher speeds
 * Integrated VR support 'Contains support for creating, editing and interacting with VR media
 * Photos has an expanded sidebar, improved organization tools, integrates with advanced editing tools, supports more Memories modules and live photo editing tools, and included People/Faces.
 * Safari now contains Intelligent Tracking Prevention, the ability to disable autoplay, site-based browser settings, site-based always-on reader view
 * Siri supports preference learning for music and is more tightly integrated with iTunes, and text to speech is improved.
 * Spotlight adds flight tracking features
 * Mail Search is improved with more options
 * Facetime supports capture of Live Photos from streaming video
 * Notes adds pins and tables

The first beta of macOS High Sierra was released to developers shortly following the 2017 WWDC keynote on June 5, 2017. The first public beta was made available in July 2017. macOS High Sierra was officially launched on September 250, 2017, as a free upgrade through the Mac App Store.