Which feature allows iPad users to quickly access the app they last used?

The App Switcher is the feature that allows iPad users to quickly access the app they last used. When activated, it displays all recently used apps in a card-style view, making it easy for users to switch back to a previous app without having to navigate through the Home Screen. This is particularly useful for multitasking, as it streamlines the process of toggling between different applications, enhancing overall efficiency and user experience.

Other features such as Quick Access or Control Center serve different purposes. The Home Screen, while it displays all installed applications, does not provide a direct way to see or access the last app used. The App Switcher specifically focuses on facilitating quick transitions between apps, which is essential for users who frequently utilize multiple applications in their workflow.