As in today’s world every website owner requires an appealing and interactive website. This type of website is very important and this scripting language is embedded in HTML and interpreted by browsers but not compiled.
If you want your application to update a particular part of a specific web page then AJAX can solve your problem which people were trying to solve for years by using IFRAMES and other technologies.
AJAX allows a unique feature to perform partial page updates by allowing only those page elements to be updates that we need which provides far more better response of refresh means and if a web developer is sensible enough in designing their web pages then there is almost no detectable refresh delay of your web page.
Traditional Web applications delivered a lot of surplus information, particularly if pages were coded in old-fashioned HTML loaded with tags. In such sites the amount of structuring and presentation required may be nearly as much as that required to serve up the textual content of the page. If you are using AJAX design apt pattern then web application has to download the page layout just once and then just update the new data which reduces the bandwidth up to an extent as per user session.