What is the virtual DOM?
React's in-memory description of the UI. React compares the new description to the previous one and updates the real DOM only where they differ, a process called reconciliation, which makes updates efficient.
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React is a JavaScript library for building user interfaces by describing them as a function of state. It updates the UI efficiently when state changes, using a virtual DOM for performance.
JSX is a syntax extension for JavaScript that compiles to React.createElement calls. It looks like HTML but is JavaScript, with differences like using className instead of class.
Props are inputs from a parent, read-only in the child. State is internal data the component owns and can change, triggering re-renders. Props are external; state is internal.
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