The following 3-minute video produced by Vanderbilt University's Peabody Library provides a good overview of the differences beween popular and scholarly periodicals.
What is a Peer Reviewed Article? (From the Lloyd Sealy Library at John Jay College of Criminal Justice.)
What Does Peer Review Mean? (From the San Diego State Library.)
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.)