Android 8.1 Oreo is a version of the Android operating system released by Google in December 2017. It introduced several enhancements, including improved performance, better battery management, and new features like Picture-in-Picture mode, which allows users to watch videos while using other apps. This update also brought a refined notification system, enabling users to manage notifications more effectively. Additionally, Android 8.1 Oreo included support for Neural Networks API, enhancing machine learning capabilities on devices. Overall, it aimed to provide a smoother and more efficient user experience on compatible smartphones and tablets.