How React Works Behind the Scenes

React's rendering process converts JSX to React elements, creates a Virtual DOM, and updates the real DOM efficiently. JSX transforms into React.createElement() calls, creating React elements. React builds a Virtual DOM tree and compares it with the current Fiber tree on updates. The diffing algorithm determines necessary changes based on element types and keys. React generates an effect list of required DOM updates and applies them in the commit phase. This process optimizes performance and enables features like incremental rendering.