Peer reviewed sources are those that have been vetted by scholars in a given field. For example, before a peer reviewed, or refereed, journal will publish an article, it is first sent to a handful of scholars in that field to conduct a blind review. They will often return the article with suggestions for improvement before recommending that the journal publish the article. This is considerably different than popular magazines and other sources that do not employ such rigorous publishing standards. The result is a higher level of scholarship than might otherwise be published.