Android Marshmallow is the sixth major version of the Android operating system, released by Google in October 2015. It introduced several new features aimed at improving user experience, including a more refined app permissions system that allows users to grant permissions on a case-by-case basis. Another significant addition was Google Now on Tap, which provided contextual information based on what was displayed on the screen. Android Marshmallow also enhanced battery life with a feature called Doze, which puts apps into a sleep mode when the device is not in use, helping to conserve power.