Cocoa Touch
Cocoa Touch is Apple's native application framework for building iOS, iPadOS, tvOS, and watchOS apps. It provides a set of Objective-C and Swift APIs for creating user interfaces, handling touch events, and accessing device features like cameras and sensors. The framework includes UIKit, which is central for developing graphical, event-driven apps on Apple's mobile platforms.
Developers should learn Cocoa Touch when building native apps for Apple's iOS ecosystem, as it offers direct access to platform-specific features and optimizations for performance and user experience. It is essential for creating apps that require deep integration with iOS hardware, such as those using ARKit, Core Location, or HealthKit, and is the standard for apps distributed through the App Store.