Redux is a library used for state management in JavaScript applications. It is designed primarily for use with React but can also be used with other JavaScript libraries. Redux manages application state in a central store and allows for managing state changes in specific and predictable manner.
Redux simplifies state management, streamlines data communication between components, and makes the expected behavior of the application more predictable. However, learning and implementing Redux can be challenging for some developers and may introduce unnecessary complexity in small applications. Therefore, the use of Redux should be evaluated based on the size and complexity of the application.