The term refers to the capacity of specific hardware and software configurations to function correctly with the iOS 19 operating system. For example, a particular iPhone model’s ability to run the software without errors or performance degradation would be a key indicator of this. Similarly, an app developed with older APIs may require updates to achieve satisfactory functionality on the new operating system.
Proper function across devices and applications is vital for user satisfaction and seamless transitions following software updates. Historically, operating system upgrades have rendered older hardware obsolete, forcing users to upgrade devices. Application developers must also adapt their software to maintain functionality and take advantage of new features, impacting ongoing support and development costs.