Ajax allows web pages to be updated without having to reload the entire page. This makes for a more fluid user experience, as users don’t have to wait for a page to load completely before they can start using it.
Ajax also enables developers to send data from the server to the client (and vice versa) without having to refresh the page. This makes it possible to create more sophisticated applications that can interact with the user in real-time.
To learn more about Ajax, check out this tutorial: