Which programming language is developed by Apple for iOS and macOS app development?

Swift is the programming language specifically developed by Apple for creating applications for iOS and macOS. Introduced in 2014, Swift was designed to be safe, fast, and expressive, incorporating modern programming concepts and providing developers with the tools to build high-performance apps with a focus on safety and ease of use. This language enables robust code management and enhances productivity by ensuring better readability and maintainability.

The choice of Swift is significant for anyone developing for Apple's platforms, as it integrates seamlessly with Apple's Cocoa and Cocoa Touch frameworks. Swift also offers interoperability with Objective-C, allowing developers to use both languages within the same project, making it easier to transition existing applications to the newer Swift language while leveraging contemporary programming capabilities.

Other languages mentioned, such as Kotlin, C#, and Java, are used for different ecosystems. Kotlin is primarily associated with Android app development, C# is often used in Windows application development and game development through Unity, and Java serves as a foundational language within many enterprise environments and Android applications, but none are specifically tailored for Apple's ecosystem as Swift is.