A scholarly journal

  Scholarly articles are written by experts in the field and, additionally, reviewed by a panel experts in the field. They tend to include a lot of research and data, and the information in the article is backed up by a list of references. Journals are published quarterly or bi-annually.

A popular magazine

Popular articles are often written by journalists for a general audience and are not reviewed by experts in the field. Popular articles rarely include references. Popular publications are published daily, weekly and monthly.

For more detailed information on what a scholarly article looks like, see the tutorial Anatomy of a Scholarly Article.