Peer review is a process of subjecting articles to a rigorous review process. Experts in the field will read the articles for accuracy, authority and originality and suggest any changes or revisions that need to be made before the article can be published.
Things to consider:
An "about the journal" page is a good place to start investigating the journal. This page will list the editor-in-chief, associate editors and editorial board, provide a statement on the scope and audience for the journal, the types of articles published, the publication frequency of the journal, what kind of peer review process is followed, and other information that can be helpful.
Here are some examples of "about the journal" pages:
Chemistry and Geophysical Sciences Librarian
Andrea Twiss-Brooks
Regenstein 103; 773-702-8777
Computer Science, Mathematics, Physics and Statistics Librarian
Jenny Hart
Crerar Library; 773-702-7569
Business and Economics Librarian
Greg Fleming
JRL 100B; 773-834-8987