Scholarly articles in academic journals present in-depth, original research. These types of articles may be referred to as peer-reviewed, or academic journal articles.
--present in-depth, original research (a scientist's new data, results, and theories) in a specific field of study.
--have been reviewed by other scholars in the field for scholastic standards and validity
--are original publications of a scientist's new data, results, and theories
--will typically have the following sections: Abstract, Introduction (with Literature Review), Methods, Results, and Discussion
Journal articles may be primary literature, but, there are many articles published in scholarly/academic journals that are not primary literature, particularly review articles, which do not report new findings but review known data.