All of these technologies work together to create a single HTTP or HTTPS request. According to Jesse James Garrett, who first coined the term, the following technologies are involved:
- Document Object Model
- XMLHttpRequest Object
In WordPress, AJAX can be seen in action in the post edit screen where you can add a new category while writing a post without reloading the page. Another example can be seen on the comments page where you can approve or delete a comment without reloading the page.
Gmail is noted by web developers for its pioneering use of AJAX.