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You have an .ipa file — an iOS application package. Every app on your iPhone arrived as an IPA through the App Store, but Apple doesn't let you see, save, or sideload them on standard iOS devices. IPA files are visible primarily in enterprise deployment, TestFlight beta testing, and developer workflows.
An IPA is technically a ZIP archive containing the compiled app binary, resources, assets, and code signature. Apple's code-signing requirements mean that an IPA only runs on devices that trust the signing certificate — App Store certificates (for public apps), enterprise certificates (for internal corporate apps), or development certificates (for testing). This locked-down approach is Apple's security model for iOS.
Standard iOS devices install apps only through the App Store or TestFlight. Apple Configurator (macOS) can install IPA files on managed devices. Developers use Xcode to build and deploy IPA files during development. Sideloading on standard iOS is not supported — and third-party signing services carry real security and account risks.