React is a library for building user interfaces by describing the UI as a function of state. It solves the complexity of manual DOM manipulation in interactive, stateful apps by letting developers describe the desired UI while React handles DOM updates.
JSX is syntax that compiles to React.createElement calls. It looks like HTML but is JavaScript, with differences like using className instead of class. A build step or Babel converts JSX into regular JavaScript.
React is the core library that defines components and elements. ReactDOM is the package that connects React to the real DOM. This separation allows React to target other renderers beyond the browser.
It creates a root that connects React to a DOM node. Calling render on it turns your UI description into actual DOM nodes. In React 18, it also enables concurrent rendering features.
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