AJAX stands for Asynchronous JavaScript and XML. AJAX is a new way to build better, faster, more interactive web applications with the help of XML, HTML, CSS, and JavaScript.

Ajax uses XHTML for content, CSS presenting, and Document Object Model and JavaScript for dynamic content display.

  • Standard web applications transfer data from and delete using sync applications. It means you fill out a form, hit submit, and be redirected to a new page with new information from the server.
  • With AJAX, when you hit the submission, JavaScript will apply to the server, translate the results, and refresh the current screen. In a pure sense, the user never knows that anything has been transferred to the server.
  • XML is widely used as a data receiver format, and any format, including plain text, can be used.
  • AJAX is an independent web browser technology for web software.
  • The user can continue to use the app while the customer system requests information from the server in the background.
  • Accurate user interaction. Clicks are not required, mouse movement is the beginning of an adequate event.
  • Data processing is different from page processing.

JavaScript and XML

As mentioned above, "J" in AJAX stands for JavaScript. JavaScript is a type of scripting language - the encoding languages ​​used to modify web processes so that web developers do not have to edit each process from the page. In the case of JavaScript, it is used directly to create, add, and manage dynamic website content. In other words, after easy languages ​​such as HTML and CSS are used to create and display static web features (titles, fonts, categories, etc.), JavaScript is used to control features that require real-time updates while the visitor views the page (think interactive maps, animated graphics, scrolling video, jukeboxes, etc.). Since JavaScript is in the business of updating page content without requiring viewers to reload all pages, it is a critical aspect of AJAX's asynchronous update.


The “X” in AJAX is XML (Extended Language). As its name suggests, XML is a graphic language, which means it is in the same family as languages ​​such as HTML and CSS. Markup languages ​​are writing languages ​​used to describe parts of a web document intended to give web browsers instructions on how to understand, process, and display a web page, in comparison to the actual text intended to be displayed on the page. While HTML and CSS are focused on teaching how page content is displayed (categories, titles, fonts, colors, etc.), XML is used to transfer data stored on the page to browsers that view it. 


Individual computer programs are often incompatible and cannot understand or interact with data formatted by a different program. XML allows developers to overcome this obstacle by storing data in plain text format between XML tags. By doing this, XML provides a way to store, transmit, and share data that does not depend on a particular software or hardware system (something very important online, where data needs to be accessed and understood across all software and hardware platforms). RSS feeds - web feeds that allow users access to content from blogs and media as they are updated in real time - are built with XML and are an example of language sharing skills. But how does XML and JavaScript combine to form AJAX?


How does AJAX work?

According to Cascarano, JavaScript and XML combine to make asynchronous updates possible using an XMLHttpRequest object. When a user visits a webpage designed to use AJAX and a specific event occurs (the user loads the page, clicks a button, fills out a form, etc.) JavaScript creates an XMLHttpRequest object, which transfers data to an XML format between a web browser web (software or hardware where website information is stored). The XMLHttpRequest item sends a request for updated page information to a web server, the server processes the request, the response is performed on the server side and sent back to the browser, which then uses JavaScript to process the response and display it on screen as updated content.


Reconfiguration: JavaScript activates the update process, the application for updated content is formatted in XML to make it understandable worldwide, and JavaScript also kicks off the content-appropriate content for the user looking at the page. Cascarano notes that the AJAX process ignores external page information and only handles requests for updated information and personally updated information. This is actually the heart of AJAX performance, making websites and apps that use AJAX faster and more responsive to users.