What is Peer-Review?
In the most general of terms, peer-review is the act of having another writer read what you have written and respond in terms of its effectiveness. This reader attempts to identify the writing's strengths and weaknesses, and then suggests strategies for revising it. The hope is that not only will the specific piece of writing be improved, but that future writing attempts will also be more successful. Peer-review happens with all types of writing, at any stage of the process, and with all levels of writers.
Sometimes peer-review is called a writing workshop.