Android M is finally here. Google unveiled a new version of its much loved OS at its annual I/O event a few days back which is now available for download as developer preview for Nexus 5, 6, 9 and Nexus player owners. After the introduction of android Lollipop last year with an all new Material Design, the new Android M focuses on greater control and improved user experience. Android M, aimed at taking on Apple's iOS 9, is all set to take the android ecosystem to a next level. Before getting into its feature set, it is important for you to know that Android M is not a complete overhaul like android Lollipop. Rather, it's a refinement. Just some major tweaks over previous version of android.