An file is the installation format used by Apple for its mobile apps. While you normally download apps directly from the App Store, an IPA file allows you to "sideload" the app manually onto your device using a computer or third-party tools. Why Sideload a Modified YouTube IPA?
If your iPhone is running a vulnerable version of iOS (specifically 15.0 to 16.6.1), you can install . This exploits a bug to install IPAs permanently. Youtube Ipa File