Explain the concept of immutability in Redux.

 Immutability in Redux refers to the principle that the state should never be modified directly, but rather replaced with a new object that reflects the updated data. This ensures that the state remains predictable and that changes are always traceable, which is essential for debugging and performance optimization.

To achieve immutability in Redux, you should always return a new state object from your reducer functions, rather than modifying the existing state. This can be done using techniques like object spread syntax or the Object.assign() method. Libraries like Immutable.js can also help you manage immutable data structures more efficiently.