Learn about AJAX, a collection of web technologies that allows a JavaScript program to interact with web servers “in the background,” to dynamically update a page in a browser after its initial...

Learn about AJAX, a collection of web technologies that allows a JavaScript program to interact with web servers “in the background,” to dynamically update a page in a browser after its initial loading. What kinds of applications can you build in AJAX that you couldn’t easily build otherwise? What features of JavaScript are most important for making the technology work?