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Flutter is an open-source UI software development kit created by Google that enables developers to build cross-platform applications for Android, iOS, web, and desktop from a single codebase. It achieves native performance and high-quality visual consistency across platforms by bypassing traditional web views and rendering its interface directly through its own high-performance graphics engine. The framework uses the Dart programming language, which is optimized for fast user interfaces, and relies heavily on a flexible “widget-based” architecture where every visual and structural element of the application is a customizable component. A standout feature of Flutter is its Hot Reload capability, which allows developers to inject source code changes into a running application instantly without losing its current state.