The term refers to a method of sideloading applications onto iOS devices without requiring a jailbreak. Specifically, it encompasses the distribution and installation of iOS application packages (.ipa files) through an alternative app store, often circumventing the official Apple App Store. For example, a user might employ this process to install a beta version of an application or a modified version of a game.
Its significance lies in providing users with greater control over the software they install on their devices, potentially accessing apps unavailable through official channels. Historically, sideloading has been a common practice in various mobile operating systems, offering developers and users flexibility. However, this approach also presents security considerations, as applications obtained outside the official store may not undergo the same rigorous vetting process.