Amazon Prime APK is a file that allows users to access Amazon Prime services on their Android devices. It provides access to streaming movies and TV shows, music, games, and more. To install it, follow these steps:

1. Download the APK file from a trusted source.
2. Enable app installation from unknown sources in your device's security settings.
3. Open the file manager and locate the downloaded APK file.
4. Tap on the file to begin the installation process.
5. Follow the on-screen instructions to complete the installation.

Note: Some devices may require root access to install APK files.