Peer-reviewed journals publish articles that have been reviewed by experts in the field.
These highly respected experts (peers, referees, reviewers) read the submitted article and decide if it is acceptable for publication. If the article is acceptable, peer-reviewers may suggest changes or corrections.
Peer-reviewed articles are also known as refereed articles. Both scholarly and professional journals may be peer-reviewed. But not all of them will be.
Most (but not all) databases will have a peer-reviewed limiter.
You'll find the peer-reviewed limit box (see image to right) under the Advanced Search option.
Peer-Reviewed limit not available?
Check The Serials Directory to determine if the article's journal is peer-reviewed.