Dynamic pages change every time they are loaded, they can change their content based on what user does or queries, like clicking on some text or an image. The most popular dynamic pages are those using content management system or CMS these pages database driven type. Many professional web design service use these technologies all over the world
In CMS the web page when loading fetches content from a database and subsequently inserts that content into the web page design each time it is loaded. Thus if the content in the database changes, the web page will also change automatically without human intervention.
One such example is the online banking web pages where you can find out your bank balance by logging in using your password and user name supplied by the bank. These pages are secured by using technologies like SSL or secure socket layer where in the password and user name is encrypted before sending them to the server. The online shopping carts and product brochures on the website are also database driven and hence dynamic. The advantage of database dynamic web pages are that the number of page design is reduced and the same format fetches contents per the user query.
Large Company website find this method very useful and it becomes easy to display large number of their products and information content easily and without it being cumbersome.
Your bank account information is stored in a database and that has been connected to the web page with programming thus enabling you to see your banking information. CMS or database driven web sites is developed by implementing in programming various competing technologies, each with its own advantages. Example DHTML, Java Script, ASP and Perl etc.