An IPA file is a zip archive that contains an iOS app and its metadata. It's essentially the package that Apple uses to distribute apps through the App Store. When you download an app from the App Store, it comes in the form of an IPA file.
If you own an old device like the original iPad or an iPhone 4, the official way to get apps is through the tab in the App Store. How it works ipa ios 5.1.1
iOS 5.1.1 was a "golden era" for jailbreaking. Many users still seek IPAs specifically for use with An IPA file is a zip archive that