Ajax = Asynchronous JavaScript and XML (a subset of Standard Universal Markup Language).
Ajax is a technology for creating fast, dynamic web pages.
Ajax is a technology that allows you to update parts of a web page without reloading the entire page.
Ajax allows web pages to update asynchronously by exchanging a small amount of data with the server in the background. This means that parts of a web page can be updated without reloading the entire page.
Traditional web pages (without Ajax) must reload the entire web page if content needs to be updated.