"Scholarly" and "peer-reviewed" are terms often used synonymously when describing print and Web resources of an academic nature. They include:
The term "popular" is used to refer to non-scholarly sources intended for a mass audience, though this does not necessarily imply that such sources are inferior to scholarly sources. Popular sources include:
Some sources are neither scholarly nor popular, and may appear in either context. These include:
Peer review is a lengthy process that ensures what a journal publishes is featuring new ideas or discoveries, coming from a reliable source, and is a good fit for the intended audience of the journal. Along with ensuring the content is accurate and relevant, the peer review process also checks that the author's writing is clear and there are no spelling or grammatical errors and the format is correct.
For more information on the peer review process and how a journal publishes new articles, check out https://www.elsevier.com/reviewers/what-is-peer-review