Peer review is the process of submitting drafts of articles for critical assessment by experts in the field or discipline before articles are accepted for publication in scholarly journals. The peer review process helps ensure the quality of informtion that is published in that field.
Primary research articles are written by the scientists who are reporting on their own original research/experiment in order to communicate their discoveries or findings to other scientists. Articles follow a specific structure and contain several main elements: abstract, introduction, methods and materials, results, conclusion/discussion, and a bibliography or references of all sources cited.