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.
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An Electronic Journal (or E-journal) is a traditional journal that is in an electronic format; either because it was originally created that way, or because someone took a print journal article and scanned it to make it available electronically.
A Database is what is created when a large number of electronic journals are put in one place and a search interface (usually a search box) is added to help find what you need. Both databases and electronic journals can be subject specific. When you have a database that only has the title or abstract, but not the full text, it is usually referred to as an Index.