Let me take an example. You have made a form in which say there is a place for phone number. Now if you do not give a 10 digit phone number the form will not be submitted when you submit it and you will continually be getting an alert until you fulfill the criteria of giving the phone number a 10 digit number. This is completely done with the help of a jquery.
Similarly, Ajax is also implemented in your website to give more and more functionality to your website. With the help of Ajax you can exchange data with the help of the servers. Ajax technology is based on HTML and CSS technology.
Now let us take an example of Ajax, say suppose you integrate Ajax in the previous form. While you type whatever you want in your phone number column, it will show you even before submission that you need a ten digit number, otherwise the submission will not be accepted. Or suppose you want to search the name of a friend in your profile whose name is 'Jina' and the moment you type' j' you get the list of all friends whose name starts with 'j'. This is the wonderful feature of Ajax.
With the help of Ajax you don't have to wait for the server to load the pages. Ajax helps the pages to be processed and changed without loading the full page in your web browser. Data can be retrieved with Ajax using the XML HTTP request.
The Ajax has some technologies integrated within it that makes it so popular among the web developers and they try to integrate those facilities within the website codes to give better functionality, better security and better looks to your websites. Ajax has the following technologies integrated with it:
HTML/XHTML and CSS for creating presentations
DOM for dynamic display and interaction with various types of data
XML for data interchange
Because of so many features web application developers use jquery and Ajax during the development of their websites.
Disclosure: I have no positions in any stocks mentioned, and no plans to initiate any positions within the next 72 hours. I wrote this article myself, and it expresses my own opinions. I am not receiving compensation for it. I have no business relationship with any company whose stock is mentioned in this article.