Databases are used to find PEER-REVIEWED ARTICLES, statistical information, and other information not found through Internet search engines (i.e. Google, Yahoo).
The material found within databases is generally more acceptable to use than material found on the web because it comes from professionals working in the field that you are researching. You still need to personally review material to make sure it is appropriate for your topic.
The following links will help you understand the peer review process and the difference between peer reviewed journals and magazines.