Hello dear friends. In this video, we will look to answer the question, what is Ajax question?

Let's begin. Ajax stands for Asynchronous JavaScript and XML. Ajax is a technique for creating better, faster and more interactive web applications with the help of XML, HTML, CSS and JavaScript. Ajax stands for Asynchronous JavaScript and XML. In essence, Ajax is an efficient way for a web application to handle user interactions with a web page, away, that reduces the need to do a page refresh or full page reload for every user interaction. This enables rich behavior using a browser. Ajax interactions are handled asynchronously in the background. As this happens, a user can continue working with the page.

Ajax interactions are initiated by JavaScript code. When the Ajax interactions are complete, JavaScript updates the HTML source of the page. The changes are made immediately without requiring a page refresh. Ajax interactions can be used to do things such as validate form entries using server side logic, retrieve detailed data from the server, dynamically update data on a page and submit partial forms from the page. With Ajax, when you hit 'Submit', JavaScript will make a request to the server, interpret the results, and update the current screen. In the purest sense, the user would never know that anything was even transmitted to the server. Ajax is a web browser technology independent of web server software. A user can continue to use the application while the client program requests information from the server in the background. Ajax is intuitive and natural user interaction. Clicking is not required. Mouse movement is a sufficient event trigger.

Ajax is data driven as opposed to page driven. The focus of this tutorial is on using JavaScript based Ajax functionality in Java server faces web applications. JavaScript is a dynamic scripting language for web applications. It allows users to add enhanced functionality to user interfaces and allows web pages to interact with clients asynchronously. JavaScript runs mainly on the client side and thereby reduces server access by clients. When a JavaScript function sends an asynchronous request from the client to the server, the server sends back a request that is used to update the pages' document object model. This response is often in the format of an XML document. The term Ajax refers to this interaction between the client and the server. Ajax enables asynchronous and partial updating of web applications. Such functionality allows for highly responsive web pages that are rendered in near real time.

Ajax-based web applications can access server and process information and can also retrieve data without interfering with the display and rendering of the current web page on a client. Some of the advantages of using Ajax are: Form data validation in real time, eliminating the need to submit form for verification, enhanced functionality for web pages such as user name and password prompts, partial update of the web content, avoiding complete page reloads. Now, I hope you have a better understanding of the Ajax concept. In the next video, we will use Ajax in JSP pages. See you in the next video.