Swift is a powerful programming language released by Apple and developed both by Apple and the open-source community. Swift is designed for use on the macOS, iOS, watchOS, tvOS, and other Apple platforms. It was first released in 2014 as a replacement for Apple's other programming language, Objective-C, which served as the primary Apple programming language since the 1980s. Swift is comparable in performance to Objective-C but is a more modern language with a cleaner syntax and easy-to-use generic types. Swift also has powerful protocol extensions, lightweight closure syntax, fast collection iteration, multiple return values, and functional programming features. Swift works with Apple's Cocoa and Cocoa Touch frameworks and can inter-operate with existing Objective-C codebases.