I have to be honest I don’t think I’ve ever used the word redux before and I’m not really sure what it means.
In everyday language, “redux” simply means **brought back, revived, or restored**. It’s borrowed from Latin and usually gets tacked onto the end of a title or a concept to show that an old idea has been brought back in a new, updated form (like *Apocalypse Now Redux*).
If you are asking from a software development perspective, **Redux** is a specific open-source JavaScript library used for managing application state.
In complex applications, keeping track of data (like whether a user is logged in, what’s in a shopping cart, or which UI themes are active) can get messy when dozens of components all need to share and change that same data. Redux solves this by creating a single, centralized “source of truth” for the entire application state.
Instead of components modifying data directly, the data flow follows a strict pattern:
* **The Store:** The single, central repository that holds the entire state of the application.
* **Actions:** Plain JavaScript objects that describe *what* happened (e.g., ADD_TO_CART). They are the only way to send data to the store.
* **Reducers:** Pure functions that take the current state and an action, then calculate and return the exact next state without modifying the old one.
This predictable, unidirectional data flow makes it much easier to debug, test, and maintain the state of an app because you can track exactly when, where, and why a piece of data c
hanged.
