What is a state in React?

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In React, state refers to a built-in object used to store property values that belong to a component. When the state of a component changes, React re-renders the component to reflect the updated data in the UI. This makes state a core concept for managing dynamic and interactive elements in a React application.

Each component can have its own state, which allows it to track and respond to user inputs, server responses, or any other event that affects the component. Unlike props, which are passed from parent to child and are read-only, state is local and mutable—meaning it can change over time and only affects the component where it is defined.

In a class component, state is typically initialized in the constructor:

To update the state, you should always use the setState() method (for class components) or the setter function from useState (for functional components). Directly modifying the state object won’t trigger a re-render.

Managing state efficiently is crucial in React, and for larger apps, you might use additional tools like Context API, Redux, or other state management libraries.

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