Peer review is a scholarly form of review used by journals only for journal articles. After an article is sent to an academic journal, the editor sends it to several peer reviewers—typically scholars in the field—for evaluation.
These peer reviewers examine the paper's methodology, literature review, and conclusions. They note the existence of bias or other flaws. The peer reviewers may accept the article, require rewrites from the authors, or reject the article.
If you are asked to find articles that are peer-reviewed, what you are really looking for are articles from a peer-reviewed journal.
Peer review can also be called: blind peer reviewscholarly peer reviewrefereeing or refereed