What is React.createElement?
It is the function JSX compiles down to. It returns a plain JavaScript object describing an element, including its type, props, and children. This object is React's description of the UI.
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More FAQs in How React Renders JSX Into the DOM: A Beginner's View
JSX is compiled by a build tool or Babel into React.createElement calls that return plain JavaScript objects describing the UI. ReactDOM then takes those objects and creates or updates real DOM nodes to match.
ReactDOM takes React's UI description and creates or updates real DOM nodes to match it. On the first render it creates nodes; on later renders it updates only the parts that changed.
Reconciliation is the process where React, after a state change, builds a new UI description and compares it to the previous one, then updates only the DOM nodes that differ. It is how React updates efficiently.
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