1) One way to know that an article is scholarly or peer-reviewed is if the database gives a visual indication as to whether an article is scholarly. For example, the second image below indicates that the article is scholarly, unlike the first image, which indicates it is from a periodical that is not peer-reviewed.
It's important to note, however, that this visual indication does not definitively mean the article is peer-reviewed. In fact, some articles published in peer-reviewed journals may not actually be peer-reviewed. For example, book reviews, editorials, and news items do not undergo the same review process as research articles. Therefore, even if the database gives a visual indication that the article is from a peer-reviewed or scholarly journal you still need to ask the questions given below to ensure that it is a scholarly journal article.
2) The purpose of a scholarly article is to inform and disseminate original research to scholars. Readers should ask the following questions when trying to determine if an article is scholarly (peer-reviewed):