<P> OS X 10.11 El Capitan was released on September 30, 2015 . Similar to Mac OS X 10.6 Snow Leopard, Apple described this release as containing "refinements to the Mac experience" and "improvements to system performance" rather than new features . Refinements include public transport built into the Maps application, GUI improvements to the Notes application, adopting San Francisco as the system font for clearer legibility, and the introduction of System Integrity Protection . The Metal API, first introduced in iOS 8, was also included in this operating system for "all Macs since 2012". </P> <P> macOS 10.12 Sierra was released to the public on September 20, 2016 . New features include the addition of Siri, Optimized Storage, and updates to Photos, Messages, and iTunes . </P> <P> The fall release of macOS 10.13 High Sierra was announced on June 5, 2017 at Apple's WWDC event . On September 12, 2017 at Apple's iPhone event, they announced its release to be September 25, 2017 . Like OS X El Capitan and OS X Mountain Lion, High Sierra is a refinement - based update having very few new features . High Sierra uses the new Apple File System and includes enhancements to Safari, Photos, and Mail, among other changes . </P> <P> As of July 2016, macOS is the second-most - active general - purpose desktop client operating system in use on the World Wide Web following Microsoft Windows, with a 4.90% usage share according to statistics compiled by the Wikimedia Foundation . It is the second most widely used desktop operating system (for web browsing), after Windows, and is estimated at approximately five times the usage of Linux (which has 1.01%). Usage share generally continues to shift away from the desktop and toward mobile operating systems such as iOS and Android . </P>

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