Journals are made up of articles published on a regular basis to report current research within a discipline.
Journal articles report specific aspects of the research covered by a journal. (Murdock Uni)
Library databases are online collections of journals and journal articles. They can include statistics, images, reports and books.
An article that has been peer-reviewed has been read and approved by other experts in the field before publication. Therefore, depending on your assignment topic, it may be better to use a peer-reviewed article as your source rather than one published in a popular or trade magazine.