What is Ajax?

AJAX allows web pages to be updated asynchronously by exchanging small amounts of data with the server behind the scenes. This means that AJAX applications can do things like update content without forcing the browser to reload the entire page.

E-commerce websites commonly use this feature for filter searches. It can allow users to execute a unique search, apply filters to find a product, and then immediately see the results, all without refreshing the page.

AJAX uses HTML and CSS for presenting information. It also requires Document Object Model (DOM) for dynamically manipulating content, XML (Extensible Markup Language) for data interchange, and XMLHttpRequest for asynchronous communication between the browser and the server.