Peer review has played an essential role since ancient Greece, and is the backbone to the article publishing process, and ensures high-quality research is published.
Upon submission, the paper is reviewed by the editorial office to assess originality, validity, and significance. If the editorial team is satisfied, industry peers (or assigned experts) review the paper, and decide whether to accept or reject it – generally there is feedback to make modifications as part of acceptance. It is quite common for peer reviewers to do this work voluntarily.