Redux

Redux is a JavaScript library for managing application state, particularly useful in applications built with React, though it can be used with any front-end library or framework. It was created by Dan Abramov and Andrew Clark.

In short, Redux allows for the central storage of the entire application state in one place, known as the store. This enables components to access the data they need from a common source and dispatch actions that modify the application state in a predictable manner, facilitating state management, debugging, and testing.

Redux is based on three fundamental principles:

1. Single source of truth: The entire application state is stored in a single object tree within a single store.
2. State is read-only: The only way to change the state is to dispatch an action, an object describing what should happen.
3. Changes are made with pure functions: Reducers are pure functions that take the previous state of the application and an action, and then return a new state. They do not directly modify the state but return a new copy of the state with any changes.

Redux is particularly useful in large applications, where state management can become complicated, but it may be overkill for simple projects where simpler solutions, such as the Context API in React, may suffice.