One of the most common uses of AJAX is for loading dynamic content on a web page. For example, a web page could use AJAX to load new content when a user clicks on a button, without having to refresh the entire page. This can improve the user experience by making the page feel more responsive and can also improve the performance of the website.
AJAX is also commonly used for form validation, where the form data is sent to the server in the background, and the server responds with errors or success messages without refreshing the page.
AJAX can also be used to create real-time applications, such as chat apps and live updates, which are based on a technique called long polling. In this technique, the client sends a request to the server and waits for a response. Once the server sends a response, the client sends another request, and this process continues indefinitely.
In addition to these examples, AJAX can be used for a variety of other tasks, such as creating autocomplete search boxes and infinite-scrolling pages.