IPA and PKG files are essential formats for installing applications on Apple devices, with IPA used for iOS, iPadOS, and tvOS, and PKG for macOS. To install IPA files on an iPhone or iPad, a connection to a macOS computer is necessary, utilizing either Apple Configurator or Xcode. Unsigned IPA files cannot be installed unless the device is jailbroken, as Apple enforces strict controls on app installation to prevent tampering and piracy. PKG files are exclusive to macOS systems, and their installation is straightforward. While IPA and APP formats are interchangeable for iOS installations, they serve different purposes, with IPA containing metadata for App Store listings and APP being the raw application bundle. Remote IPA deployment across multiple devices can be streamlined using solutions like Esper, which offers comprehensive device management tools for enterprises.