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Dart exists because of Flutter, and Flutter exists because of Dart. Google's UI framework needed a language that could compile to native ARM code, transpile to JavaScript, and provide hot reload during development. Dart checks all three boxes. The language is unremarkable by design — it reads like Java meets TypeScript, with null safety, async/await, and a familiar class-based syntax.
Flutter is Dart's killer app. Write one codebase, deploy to iOS, Android, web, Windows, macOS, and Linux. Flutter's widget-based architecture and Dart's hot reload (see changes instantly without restarting the app) make mobile development dramatically faster. Google's own apps (Google Pay, Stadia, Google Ads) use Flutter.
VS Code and Android Studio both have excellent Dart/Flutter extensions. `dart create` scaffolds new projects. The `pub` package manager handles dependencies. For web development without Flutter, Dart compiles to JavaScript and can replace TypeScript, though it hasn't gained much traction in that space.