Creating a Database for Joomla!/1/en
From Joomla! Documentation
Every installation of the Joomla! CMS requires a database. The database will store data such as articles, menus, categories, and users. This information is needed to make and manage your Joomla! website. Regardless of the requirements of the version, in order to install Joomla! you must have a working database, database user, database password and proper privileges for the database user.