T ParKash said..
A dynamic web page is an HTML document generated by a web application. Often, the Web page changes according to information sent to the Web application by the browser. When a Web server receives a request for a dynamic web page, the server passes the request to an application server. The application server executes the Web application, which generates an HTML document. This document is returned to the application server, which passes it back to the web server. The Web server, in turn, sends the document back to the browser.
After the page is displayed, the user can interact with it using its controls. Some of those controls let the user post the page back to the server, so it’s processed again using the data the user entered.