Databases are collections of articles and other sources of scholarly information. They can be searched by using keywords, or words that describe a topic. Databases often provide peer-reviewed or scholarly articles for your research.
Scholarly journals have articles written by researchers who are considered experts in a field. These journals are also known as "peer-reviewed," "refereed" or "academic" journals. Journal of the American Medical Association (JAMA) is a scholarly journal.
Popular magazines have articles written by writers or journalists. Time or Newsweek are examples of popular journals.