I often encounter the expression "trade journal", but what is it exactly, and how does it differ from "academic journal" or "scholarly journal" or "scientific journal"?
From Virginia Tech Libraries:
Trade journals are geared towards professionals in a discipline. They report news and trends in a field, but not original research. They may provide product or service reviews, job listings, and advertisements.
Scholarly journals provide articles of interest to experts or researchers in a discipline. An editorial board of respected scholars (peers) reviews all articles submitted to a journal. They decide if the article provides a noteworthy contribution to the field and should be published. There are typically little or no advertisements. Articles published in scholarly journals will include a list of references.