Is Flutter a frontend or backend?

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Flutter 

            is a frontend framework for building mobile and web applications. It is an open-source framework created by Google and is used to develop the user interface (UI) of an app.

Flutter 

                uses the Dart programming language, which is also developed by Google. The framework allows developers to create beautiful, high-performance apps for both iOS and Android with a single codebase. It uses a reactive programming model, which allows the app to respond to user input in real-time.

Flutter's widgets are built using a modern react-style framework, which allows developers to build responsive and customizable user interfaces with ease. Additionally, Flutter includes a rich set of pre-designed widgets and tools to help developers create visually appealing and engaging apps.

In summary, Flutter is a frontend framework that allows developers to create visually appealing and responsive mobile and web apps. It is used to build the user interface of an app and does not handle server-side logic or data storage.