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What is ReactJS?

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A JavaScript library for building user interfaces.

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Who developed ReactJS?

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Facebook.

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What is the main purpose of ReactJS?

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To build single-page applications with a component-based architecture.

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What are components in ReactJS?

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Reusable pieces of UI that can manage their own state.

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What is JSX?

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A syntax extension for JavaScript that looks similar to XML or HTML.

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What is the virtual DOM?

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A lightweight copy of the actual DOM that React uses to optimize rendering.

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What is state in React?

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An object that determines how that component renders and behaves.

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What are props in React?

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Short for properties, they are used to pass data from one component to another.

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What is a React Hook?

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A special function that lets you use state and other React features in functional components.

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What is the use of useEffect Hook?

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To perform side effects in functional components.