XAPK is a file format used to distribute Android applications, especially those that are large or require additional resources beyond what a standard APK file can contain. An XAPK file is essentially a ZIP archive that bundles the APK file itself along with other assets like OBB (Opaque Binary Blob) files, which are used to store large game assets, media files, or other data. This bundling is done to overcome the size limitations imposed by the Google Play Store on APK files. The XAPK format allows developers to package all necessary components of an application into a single, easily distributable file. When an XAPK file is installed, the APK is installed like normal, and the OBB files are extracted to the correct location on the device's storage, usually within the Android/obb directory. This ensures that the application has access to all the required resources. Using XAPK files simplifies the installation process for users, as they don't need to manually download and place OBB files in the correct directories. However, it also requires specialized installers that can handle the extraction and placement of these additional files.