Flux is an architecture pattern (from Facebook) for managing state with unidirectional (one-way) data flow. It was the conceptual basis for Redux and influenced most modern state libraries. The core idea: data flows in a single, predictable direction.
The unidirectional cycle
Action → Dispatcher → Store → View
↑ │
└───────────────────────────────────┘
(user interaction creates a new Action)
1. Action — a plain object describing WHAT happened ({ type: 'ADD_TODO', text })
2. Dispatcher — a central hub that sends every action to the stores
3. Store — holds state + logic; updates itself in response to actions
4. View — renders from the store; user interactions dispatch new actions
