Background processing means tasks run behind the scenes without stopping the main program.
In web applications, this allows users to continue interacting with the page while data is loading.
When background processing is used, the browser does not freeze.
Buttons, inputs, and scrolling remain active.
AJAX uses background processing to send requests without blocking the user interface.
While the server processes the request, the user can continue using the website normally.
Once the server sends the response, JavaScript receives it and updates the page.
Background processing is the main reason modern websites feel fast and responsive.
After completing this lesson, you now fully understand AJAX basics and are ready to start working with real AJAX requests.