Android Marshmallow is the most recent version of Android, released in October 2015. It focuses on improving security and user experience from the previous Lollipop version. Marshmallow includes features like a new power management system to reduce background activity and improve battery life when the device is asleep. It also allows users to individually approve or deny app access to personal data and permissions. The update introduces fingerprint authentication and other updates to notifications, system settings, and animations.