In the React lifecycle, mounting is the process of creating a component instance and inserting it into the actual DOM (Document Object Model) for the first time.
Initialization: React calculates the initial state and props of the component.
Rendering: React calls the component function (or the render method in classes) to figure out what the UI should look like.
DOM Insertion: React takes the rendered output and physically attaches it to the browser's DOM tree.
Side Effects: Once the component is successfully painted on the screen, React triggers the mounted lifecycle event (like useEffect with an empty dependency array).