Scholarly journals publish articles in a particular area of study. The articles are written by researchers sharing their original research with other scholars in their field. They are usually published by science organizations or university presses. In addition, most scholarly journals are peer reviewed, which refers to the policy of having experts in the same field examine the articles prior to acceptance for publication. The formal peer review or refereed process insures that research being reported is of the highest quality following standard research practices. Examples of scholarly peer-reviewed journals are Nature, Bioscience, and The New England Journal of Medicine.
Primary research articles are written by the scientists who are reporting on their own original research/experiment in order to communicate their discoveries or findings to other scientists. Articles follow a specific structure and contain several main elements: abstract, introduction, methods and materials, results, conclusion/discussion, and a bibliography or references of all sources cited.
Literature review or review articles summarize a particular topic and provide an overview of the current understanding of that topic. While it will not count as a primary research article, they are still very useful to students as they learn about the broader scope of their research area. The articles will cite notable studies and making connections between those studies. Often review articles look very similar to research articles but one key difference is that the methodology or methods and materials section will be missing from a review article.