The dynamic websites give possibilities to their owners uploading information via protected administrative interface. This type of websites is suitable for professional usage.
The user can easy change text, pictures, news, articles from product catalog and everything you need. You can change text in the website via web based text editor. In the dynamic websites you will be able to build in news system, polls, user registrations, products catalog, web classified ad-board, diagrams and web statistics.
This type of websites is most effective solution for sites with frequently updating content and interaction with users. The cost of the dynamic website generally is more then a static one, because dynamic website is more complicated, but it can be more effective solution for expense in a long-term plan.
It's important to know that the dynamic website can exist only on appropriate web server, with necessaries program resources. This is called hosting, offers by hosting companies.