React.Suspense is a component that let you suspend, or delay, the component rendering if the components, or soon data, are imported from outside your loaded code.
With Code Splitting, you can divide your application code into chunks and reduce the initial loading time of your application by only loading the chunk necessary for the initial render.
Suspense handles the loading state and lets you delay the rendering of parts of the application tree.
While the chunks are loading suspense shows a fallback component until the chunk is ready to render.