The Android operating system employs a system of file associations to determine which application handles a specific file type. When a file is opened, the operating system checks its file extension (e.g., .pdf, .jpg, .txt) and consults a list of registered applications. If multiple applications are capable of opening that file type, Android may prompt the user to choose an application or automatically use the application previously selected as the default.
The ability to manage file associations is important for ensuring a streamlined user experience. It allows users to customize their devices to suit their preferences and workflows. Historically, this functionality has evolved from simple “always open with” options to more granular control within the operating system’s settings.