Peer-reviewed article is an article that has been evaluated by scholars or editors for its content. These articles may also be referred to as “scholarly,” “juried,” or “refereed.” Most peer-reviewed articles contain information that has been verified or fact-checked, which gives the article a sense of authority.
Peer reviewed articles are published in scholarly journals. You can check the Ulrich's Web to see if the journal is scholarly. However, it is not necessary that all the articles published in scholarly journal are peer reviewed.
The tone of voice of peer reviewed articles is often impersonal, and claims are supported by research. Citations and bibliographies are usually included. If you are not sure if the article is peer-reviewed please check with your instructor or the librarian.