What is a stateful widget flutter?

Stateful Widgets are dynamic widgets . They can be updated during runtime based on user action or data change. Stateful Widgets have an internal state and can re-render if the input data changes or if Widget’s state changes. For Example: Checkbox, Radio Button, Slider are Stateful Widgets.

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What is size box in Flutter?

SizedBox is a built-in widget in flutter SDK. It is a simple box with a specified size. It can be used to set size constraints to the child widget, put an empty SizedBox between the two widgets to get some space in between, or something else. It is somewhat similar to a Container widget with fewer properties.

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