For scholarly journal databases, see the Databases tab on the left.
Many, but not all scholarly journals use peer review. Peer review is a process that evaluates the quality of articles submitted for a given journal. The evaluation is done by a panel of experts - or peers of the author – and the review process can be quite lengthy (articles can go through multiple rounds of review and even then, not be accepted for publication).
See the Evaluating Sources page of this subject guide and the the Understanding Peer Review guide prepared by the University of Toronto Scarborough Library for: