A dynamic website is one that can change it's page contents based on certain information or conditions using web programming languages such as php, asp, or jsp. For example if your site supported 2 different languages then the programming embedded in your web pages can check the visitors location and display only the language that you want for them. You can even change the design of your website.

One of the most useful features of having dynamic web pages is that it can display information to certain types of visitors that you specify. Your site can work with a database that can provide information about a visitor so that when they visit your website you can display information that they would be interested in. For example you have stored the type of cars that a visitor likes then you could display all the products or information for that type of car to the visitor when they come to your website. By making your website visitor aware you are more likely to attract more hits and thus more revenue through your website.

Many web pages are programming and database drivin these days as it is an excellent tool to make your site more visitor or user specific. This will show you have more of an interest in them thus making them more likely to revisit and purchase products from your website.