Scholarly journals are an important part of faculty research, as well as RTP (retention, tenure, promotion).
Here are some qualities that set them apart from "popular" sources such as newspapers, magazines, etc.
The other "big" type of publication is a trade journal. Most trades are not available at a newsstand, rather they are either published by a professional organization, union, or business. Examples of trade journals are Hollywood Reporter, Columbia Journalism Review, and Chemical Bulletin.
Popular sources can also play a role in faculty scholarship. Sometimes a short article in a newspaper or magazine can refer to an academic study, piquing the interest of other academics.
The attributes of popular sources are quite different from scholarly ones.
One way to serve your profession/field of study is to serve as a peer reviewer. It is also helpful to know what reviewers are looking for, so when you are interested in identifying a journal and submitting an article, you are better prepared. Typically, when an editor is seeking a reviewer, he or she will make a call on the journal's homepage, or through a professional listserv.
Here is an example of a call for reviewers from Oxford University Press' Lab Medicine.

There is another benefit of serving as a reviewer. If you assign your students to use a peer-reviewed article as a source, you can explain the process having seen both sides (reviewer and author).
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