Peer review is the process by which an author's peers, recognized researchers in the field, read and evaluate a paper (article) submitted for publication and recommend whether the paper should be published, revised, or rejected.
Peer review is a widely accepted indicator of quality scholarship in a discipline or field. Articles accepted for publication through a peer review process meet the discipline's expected standards of expertise.
Peer-reviewed (or refereed) journals are scholarly journals that only publish articles that have passed through this review process.