Original research articles are based on an experiment or study. The authors will report the purpose of the study, the research methodology, and results. This is a familiar structure for original research articles > IMRAD: introduction, methods, results, and discussion.
Many databases include functionality that will allow you to narrow results to peer reviewed journal articles. For more information on peer review or determining if a journal is peer reviewed, visit these sites.
Review articles summarize or synthesize content from earlier published research and are useful for surveying the literature on a specific research area. Review articles can lead you to original research articles.