In case you work with a database-driven script app for your website, all the content that you or the site users add, is saved in cells and tables within a database, not as simple text in the application files. In comparison, HTML websites are static and all the content on such a site is a part of the actual HTML files. An online store application, for instance, takes all of the prices, items, user reviews, etc, from its database and this is the same for any other script that enables you to build a dynamic website. The more the content you put, the larger the database becomes, so if you employ a script-driven website, you should make sure that your website hosting package comes with adequate database storage space. The aforementioned applies no matter what type of databases you will use - for instance MySQL or PostgreSQL.