The term identifies a pre-release version of Apple’s mobile operating system, specifically version 13. These builds are distributed to developers and select members of the public for testing purposes before the official public release. For example, individuals participating in Apple’s Developer Program often receive access to these versions to prepare their applications for the upcoming operating system changes.
Deployment of such pre-release software allows Apple to gather feedback on new features, identify and resolve bugs, and improve overall system stability. This process is crucial in ensuring a smoother user experience upon the final version’s general availability. Historically, access to pre-release OS versions has provided developers with a critical advantage in adapting to platform changes and optimizing their software.