Auto Unlock: This feature allows users to unlock their user account by presenting a paired Apple Watch close to their system but requires a Mac from at least 2013 for compatibility.
Mac OS X Sierra is easy to use and is very familiar to Mac OS users. It comes with apps such as Siri and iCloud Drive, as well as additional features and enhancements over earlier versions of the operating system. Mac OS Sierra features many new capabilities for Apple devices, and its public release date was September 20, 2016, from Apple.