When searching for articles in databases, remember that "article" generally signals a research article, where "review" will point you to review articles. Review articles can be great starting points for getting context in a topic, but they are not primary research.
Review articles offer a broad discussion and explanation of the entirety of research done in a given area up to the point of publication. Reviews are often organized conceptually, such as by chronology of studies, geographic commonalities, repeated methodologies, etc. They are a good choice for becoming familiar with an area of research and for keeping up with new developments efficiently.