Ajax(Asynchronous JavaScript and XML)

Ajax refers to a communication method in which servers and browsers can exchange data asynchronously using Javascript.
When a web page is returned from the server, it is necessary to update the entire screen, but Ajax allows you to see the same effect by updating only a part of the page. You don't have to load and render the entire page, you just have to load and update a portion of it that needs to be updated, so you can expect fast performance and smooth screen display effects.