AJAX stands for "Asynchronous Javascript And XML" (Asynchronous JavaScript and XML), which refers to a web development technology for creating interactive web applications. It is not a new programming language, but a new way to use existing standards. The biggest advantage is that you can exchange data with the server and update part of the web page content without reloading the entire page. No browser plug-ins are required. , but requires the user to allow JavaScript to execute on the browser. "PHP Ajax Quick Start Video Tutorial" will help you quickly understand this knowledge!