What are state managers used for and how do they differ from using Context?

State managers are needed for centralized management of application state, especially when the state is complex and used across different components. They help store, modify, and synchronize data between parts of the interface.

React Context is a built-in mechanism for passing data through the component tree without props. It is suitable for simple or infrequently changing state, such as themes or localization.

Differences:

• Context is not intended for frequent updates and complex state management logic; with large amounts of data, it can lead to unnecessary re-renders.
• State managers (Redux, MobX, Zustand, etc.) provide more powerful tools: centralized storage, predictable changes, middleware for logging, asynchronous actions, etc.

Example: if you need to store and update user data, settings, and a list of items in the cart, it's better to use a state manager. If you just need to pass a theme, Context will be simpler and more efficient.