Peer reviewing is a process where submitted research is reviewed by the author's peers. For most journals, this is other scholars in that field. For our journal, you are each other's peers and you review each other's work. Peer reviewers are looking at what a paper argues and how well it supports that argument. It's not editing, copyediting, or proofreading, because peer reviewers are not concerned with the minor details of the paper, but the major parts: argument/thesis, tone, support and research, and contribution to a body of knowledge.
To keep bias from influencing you, we use a double blind peer review system. You won't know who wrote the paper you review, and the authors won't know who reviewed their paper. To this end, if you recognize a paper that you are sent to review (either as yours or as a friend's), please let us know so that we can ask someone else to review it.