The layer contains technologies to support features such as location, iCloud, and social media. All these services are not used by the developers though many parts of the system are built on top of them. ⬜The Core Services layer: The Core Services layer provides the fundamental system services that are required for the applications. The technologies in this layer help developers to build applications that look and sound great. ⬜The Media layer: The Media layer provides the graphics and audio and video frameworks to create the best multimedia experience available on a mobile device. Frameworks in this layer provide the basic application infrastructure and support key technologies, such as multitasking, touch-based input, and many high-level system services. ⬜The Cocoa Touch layer: The Cocoa Touch layer contains the key frameworks required to develop the visual interface for iOS applications.
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