Redux is a state management framework for the front-end, providing a simple and clean implementation of one-way data binding. It centralizes three aspects of data management: data storage, update logic, and view updates. Redux stores all data in a centralized location in memory, called a Redux Store. The rest of your app interacts with your app state through this Redux store object. All logic for updating data based on actions is located in the root reducer function. This function may be made by composing smaller update functions, which each manage portions of the data. Your app subscribes to updates to changes in the Redux store's data, and updates your views when necessary. The general rule of good software development is to use the simplest solution until it's no longer enough for the problem at hand. Redux should be used when data and updating logic would benefit from centralization, unlike an ad hoc event system that Redux centralizes all data flow and update logic. Another powerful aspect of Redux is the developer tools suite that the Redux community has made available, which includes the ability to inspect and manipulate the Redux store in real-time. Redux can be used with React.js or Vue.js, but it's most popularly used with React.js. The Redux React API has two main flavors: the original API using Higher-Order Components (HOCs) and the new Hooks API. Redux should be considered when building a complex app that requires state management, especially for apps with multiple layers of self-contained components.