Launched in 2001 as Mac OS X, the series is the latest in the family of Macintosh operating systems.
Mac OS X succeeded "classic" Mac OS, which was introduced in 1984, and the final release of which was Mac OS 9 in 1999.
Android 4.4 is the biggest update, bringing significantly reduced memory usage — but, if you have a device that came with a recent version of Android, it probably already runs well and these memory reductions are only nice to have.
Google is updating Android without actually updating the Android operating system.
As of mac OS Sierra: Arabic, Catalan, Croatian, Chinese (Simplified), Chinese (Traditional), Czech, Danish, Dutch, English, Finnish, French, German, Greek, Hebrew, Hungarian, Indonesian, Italian, Japanese, Korean, Malay, Norwegian, Polish, Portuguese (Brazil), Portuguese (Portugal), Romanian, Russian, Slovak, Spanish (Mexico), Spanish (Spain), Swedish, Thai, Turkish, Ukrainian, Vietnamese previously Mac OS X and later OS X) is the current series of Unix-based graphical operating systems developed and marketed by Apple Inc.
designed to run on Apple's Macintosh computers ("Macs"). Within the market of desktop, laptop and home computers, and by web usage, it is the second most widely used desktop OS after Microsoft Windows.
A Software Update is an incremental update of the Mac OS and its applications, Security Updates, device drivers, and firmware updates.