Angry Birds Epic Checking Expansion File -

Modern mobile games often exceed the basic 50MB to 100MB limit of app stores. To distribute larger games, developers use (Android) or a similar asset bundling system on iOS. The core app (the APK on Android or the .IPA on iOS) contains the code, while the "expansion file" (usually a .obb file) contains the heavy assets: art, music, voice lines, 3D models of birds and pigs, and the entire level database.