Zustand is a minimalist state management library for React (and other frameworks). Unlike Redux, which requires actions, reducers, and middleware setup, Zustand lets you create stores with a simple API. You define state and actions directly; Zustand handles subscriptions, re-renders, and persistence. The library is tiny (2.6 KB), has no dependencies, and follows React hooks conventions. Zustand is used by developers building mid-sized React applications who want state management simpler than Redux but more efficient than React Context API.