What is Swift and what are its key features?

Swift is a powerful and intuitive programming language developed by Apple for iOS, macOS, watchOS, and tvOS app development.\n\n• **Key Features:**\n• Modern syntax that is concise and expressive\n• Type safety and memory safety\n• Fast performance with LLVM compiler\n• Interoperability with Objective-C\n• Automatic Reference Counting (ARC)\n• Optionals for handling nil values safely\n• Generics for writing flexible, reusable code\n• Protocol-oriented programming\n• Playgrounds for interactive development\n• Open source with active community support\n\n**Example:**\n\nlet greeting = "Hello, Swift!"\nprint(greeting)\n