The feature in Android 9 that displays a list of recently used applications allows users to quickly switch between tasks. It presents a carousel-style interface, showing previews of each application in its last-used state. A user, for instance, can swiftly move from a web browser to a messaging application using this interface.
This functionality streamlines multitasking, enhancing overall efficiency by reducing the time spent navigating through the application drawer or home screen. Its introduction marked a significant improvement in usability compared to previous Android versions, contributing to a more intuitive user experience. This capability addresses a core need for mobile users: rapid access to frequently used applications.