Storybook State is a lightweight add‑on that gives Storybook stories their own reactive store, letting you define, read and update component state directly inside the story UI. It provides a `Store` API and two ways to inject that state – a `<State>` wrapper component or a `withState` decorator – so developers can easily showcase interactive components (e.g., modals, counters) without writing external mock data or manual re‑renders. The package is aimed at front‑end engineers building component libraries who want richer, stateful examples in Storybook.