Redux makes it possible to store all statuses in an application in a single place, which is called a store. A store is the intermediary to all of the changes of the status of the app. Using Redux, a component cannot communicate directly with another component; instead, the changes always go through a single source, which is an action. Redux can be described simply by three fundamental principles. Those three main principles, which will be briefly explained in this chapter, are summarized as follows:

• A single source of truth
• The read-only nature of the state
• The reducer principle