Android Marshmallow was initially announced at Google I/O on May 28, when it was released as the Android M developer preview. Several updates to the preview came out before Marshmallow was officially named on August 17. Google finally unveiled Android 6.0 Marshmallow, alongside the 2015 Nexus devices, on September 29, 2015.
As usual, Google's Nexus family was first to get the goods, and the brand new Nexus 5X and Nexus 6P were the launch devices for Android 6.0. Factory images for most of the existing Nexus range – the Nexus 5, Nexus 6, Nexus 9 and Nexus Player – appeared on October 5.

 
Android Marshmallow isn't an overhaul of everything you thought you knew about Android. Rather, it's a refinement and extension of the core features and functionality of Android Lollipop.

Android Marshmallow


Android Marshmallow is visually similar to its predecessor, Lollipop, in many ways. Google’s Material Design language is now more pervasive than ever before and the main areas of the UI – settings, notifications shade and navigation – remain the same. But Marshmallow does have some differences in appearance and new features.
Global Android version distribution since December 2009. As of January 2016, Android 4.4 "KitKat" is the single most widely used Android version, operating on 36.1% of all Android devices accessing Google Play. The second are different Android "Lollipop" versions (5.0–5.1.1), with a combined share of 32.6%.

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