For reactive state management, Flutter developers often use ________, which allows automatic tracking of changes in the state.

For reactive state management in Flutter, developers often use 'MobX,' which allows automatic tracking of changes in the state. MobX is a state management library that employs observables and reactions to automatically update components when the underlying state changes. It simplifies the development of reactive applications by efficiently managing state changes and reducing boilerplate code. Understanding MobX is essential for Flutter developers pursuing advanced state management solutions.