Applications designed for the iOS operating system possess the capability to execute certain operations even when the user is not actively interacting with them in the foreground. This functionality allows for tasks such as playing audio, monitoring location changes, or receiving push notifications while the application is minimized or the device is locked. For example, a music streaming service continues to play music seamlessly as the user switches to another application or puts the device to sleep.
The ability to perform tasks in an inactive state is crucial for providing a richer and more convenient user experience. It enables features like real-time data synchronization, continuous monitoring, and immediate alerts without requiring constant user engagement. Historically, this capability has evolved significantly within the iOS ecosystem, with Apple introducing and refining mechanisms to balance background processing with system performance and battery life. Improved background capabilities have allowed developers to create more feature-rich and engaging applications, increasing user satisfaction and retention.