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Zustand is a lightweight state management library for React that enables global state sharing without prop drilling or Context API providers. It uses a store pattern where components can selectively subscribe to only the state slices they need, improving performance by avoiding unnecessary re-renders. The library offers a minimal API with create() for defining stores and simple selector functions for accessing state and actions. Unlike custom hooks that create separate state instances per component, Zustand maintains a single global store that all components share, making it simpler than Context API while providing similar functionality.