What is the Provider package in Flutter?

Provider is the officially recommended state management package for Flutter. It builds on top of InheritedWidget to propagate data down the widget tree efficiently. You wrap a part of the tree with a ChangeNotifierProvider, expose a ChangeNotifier model, and any widget can access it via context.read() (one-time access) or context.watch() (subscribes to changes). When notifyListeners() is called, only the widgets watching that provider rebuild.