Asynchronous JavaScript and XML (Ajax) is a web technique used to transfer data between the browser and server asynchronously without posting the web pages to the server. "Asynchronous" implies that the processing of web page continues while the Ajax request is sent to the server and the response received from the server. Web pages, or part (s) from a web page, is refreshed with the Ajax response without reposting the web page. Ajax has some advantages over non-Ajax web applications. - Reduce response time and reduce server load, as a complete web page not announced. - Reducing the bandwidth of web applications as only data is transferred and the HTML format is applied in the browser.