Some journal articles are peer reviewed (also known as Refereed). Peer reviewed articles carry more authority than other articles because their content has been reviewed by subject experts prior to publication. Databases allow you to limit your search to peer reviewed materials, or as in the example below, by a refereed article. By doing so, you assure that the resources you are using are reliable and acceptable for scholarly work.
You may not always have the option to limit your results to peer reviewed articles on the first screen. You might need to do an advanced search or complete a search and then select peer reviewed on the results screen.