The following 3-minute video produced by Vanderbilt University's Peabody Library provides a good overview of the differences beween popular and scholarly periodicals.
Distinguishing Scholarly Journals from Other Periodicals
(Permission received from Research & Learning Services, Olin Library, Cornell University Library, Ithaca, NY to reproduce and adapt this guide for our own use.)
Peer Review in 3 Minutes. A brief video on how articles get peer reviewed and the role peer review plays in scholarly research and publication. (Produced by the North Carolina State University Library.)