Journals are scholarly, and some are also peer-reviewed, meaning the articles were reviewed by other scholars (peers) before being published. A scholarly journal article may be a review article or a research article. Review articles are an attempt by one or more writers to sum up the current state of the research on a particular topic. Research articles publish the results of studies and experiments. They often contain a summary or "abstract," a description of the research, the results and the significance of the results.
More tips about determining whether something is scholarly or popular are available at Popular Magazines vs. Scholarly Journals.