Q. I need a scholarly journal or peer-reviewed article, what is that?
Many library databases offer the ability to limit your results to "scholarly" or "peer-reviewed" publications. This feature is typically available in the limiters menu (either pre-search under the advanced page or in the limiters menu of the search results page). Note that this will limit to publications that are peer reviewed, but may contain items which are not, such as editorials, books reviews, etc.
Scholarly journals are used in university or research settings by faculty members, researchers, and students. They are written for an academic and research audience of readers.
The articles within a peer-reviewed journal go through an in-depth review process by experts in the field prior to publication. The strict review and publication guidelines bring a high level of credibility to the author's research. This short video describes the peer review process. Professors often prefer these types of journal articles for these reasons.