Flutter is a mobile application development framework created by Google. It uses the Dart programming language and allows developers to build natively compiled applications for mobile, web, and desktop from a single codebase.
In Flutter, the user interface of an app is built using widgets. A widget is a small piece of the user interface, such as a button or a slider, that can be composed together to create more complex layouts. Flutter includes a large collection of built-in widgets, and developers can also create their own custom widgets.
To build the user interface of an app in Flutter, developers use a declarative style of programming, in which they describe the desired end result rather than specifying the exact steps to achieve it. This means that developers can focus on defining the layout and appearance of their app, rather than worrying about the details of how it will be drawn on the screen.
When a Flutter app is run, the framework creates a tree of widgets that represents the app's user interface. The tree of widgets is then rendered to the screen using the Skia graphics engine, which converts the widgets into platform-specific visuals. This allows Flutter apps to have a consistent look and feel across different platforms, while still being able to take advantage of the native capabilities of each platform.
Overall, Flutter makes it easy for developers to create beautiful and responsive user interfaces for their apps, and its declarative programming style helps to make the code more maintainable and easier to understand.
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