Android UI refers to the user interface of devices running the Android operating system. It includes elements like buttons, menus, and icons that allow users to interact with their devices easily. The design focuses on usability and accessibility, ensuring that users can navigate apps and settings intuitively. The Android UI is built using a combination of layouts, views, and resources. Developers can customize the interface using XML files and Java or Kotlin programming languages. This flexibility enables the creation of diverse applications that can cater to different user needs and preferences while maintaining a consistent look and feel across devices.