An file is an archive containing a binary for an iOS application. In a standard scenario, IPAs are downloaded directly from the Apple App Store. "Sideloading" refers to the process of installing an IPA from a source other than the App Store, typically using software like Xcode, AltStore, or Sideloadly.
– not without workarounds. Apple’s stringent security measures (code signing, provisioning profiles, and App Store validation) prevent standard users from installing random IPA files. Sideloading requires a paid Apple Developer account ($99/year), a tool like AltStore or SideStore, or a jailbreak. apple music ipa install