What is the main function of the AppBar widget in a Flutter application?

The main function of the AppBar widget is to provide a standard toolbar for the Scaffold.

AppBar typically contains:

• leading — a widget on the left (e.g., a "Back" button).
• title — the title of the bar.
• actions — a list of widgets on the right (e.g., action icons).
• bottom — a widget positioned below the bar (e.g., TabBar).

It is part of Material Design and helps create a consistent top app bar for screens.