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Flutter is Google’s UI toolkit for building beautiful, natively compiled applications for mobile, web, desktop, and embedded devices from a single codebase. It is an open-source software development kit maintained primarily by Google. Flutter enables a developer to construct a very flexible and slick UI while allowing the definition for the UI and business logic to be reused to build for and deploy to multiple platforms. It has several significant differences that allow for Flutter to have more flexibility in its UI and animation capabilities.