Swift
In plain terms
Apple's modern language for iOS, macOS, and beyond.
Going deeper
Swift replaced Objective-C with safer, more concise syntax, optionals to handle nulls, and strong performance. It's now open source and expanding to servers.
Under the hood
Optionals and value-type semantics (structs) reduce whole bug classes; ARC (automatic reference counting) manages memory without a tracing GC.
Examples
iPhone apps, macOS apps, SwiftUI, server-side Vapor, watchOS.
Think of it like...
Like a precision-engineered tool designed to fit one ecosystem's hand perfectly.