Popular Magazines and Scholarly Journals: What's the Difference?

First are some examples of popular magazines and scholarly journals. Generally, you'll find popular magazines at a supermarket or newstand.

Popular Magazine
Scholarly Journal

Newsweek, Sports Illustrated, Psychology Today

JAMA, Harvard Business Review, Journal of Abnormal Psychology
What is its purpose?
Who are the articles' authors?
Who is the audience?
What kind of language is used?
Who is the publisher?
Do articles contain a bibliography/ works cited page?
Does it contain photographs & other graphics?