What process allows users to install untrusted apps from a website using the .apk file format on a mobile device?

The correct choice involves the process known as sideloading, which allows users to install applications from source files, such as .apk files, outside of the official app store ecosystem. When users sideload an app, they can bypass the restrictions imposed by the device’s operating system and download applications from third-party sources or websites. This capability is particularly useful for installing apps that are not available in the app store but carries inherent risks, as these untrusted apps might contain malware or other security vulnerabilities.

Sideloading is often used by developers for testing applications or by users who want access to specific functionalities. However, it typically requires the device’s settings to be modified to allow installations from unknown sources. Understanding this process is crucial for recognizing both the flexibility and potential security implications involved with installing unverified applications on mobile devices.