Ajax (programming) - Wikipedia
https://en.wikipedia.org/wiki/Ajax_(programming)
Ajax is a set of web development techniques using many web technologies on the client-side to create asynchronous web applications. With Ajax...
AJAX Introduction
https://www.w3schools.com/xml/ajax_intro.asp
AJAX allows web pages to be updated asynchronously by exchanging data with a web server behind the scenes. This means that it is possible to update How AJAX Works. 1. An event occurs in a web page (the page is loaded, a button is clicked). 2. An XMLHttpRequest object is created by JavaScript.
jQuery.ajax() | jQuery API Documentation
https://api.jquery.com/jquery.ajax/
The $.ajax() function underlies all Ajax requests sent by jQuery. It is often unnecessary to directly call this function, as several higher-level The jqXHR objects returned by $.ajax() as of jQuery 1.5 implement the Promise interface, giving them all the properties, methods, and behavior of a Promise...