The peer review process helps a journal maintain a good standard of research. When you submit a research article to a journal, it will be sent to a relevant expert for feedback. Different journals will use different types of peer review:
Journals should discuss their peer review process on their website. It should be found in their submission details or sometimes on their about page.
There are pros and cons to each type of peer review. Blind peer review can remove biases that the reviewer may have but it is felt that reviewers can often be overly critical. With open review, the reviewers often give more polite and constructive feedback. Post-publication review allows the reviewers to receive credit for their work and it can provide greater engagement in an article.
After reviewing your article you there are three outcomes:
Don't be discouraged with the changes suggested by the peer reviewer. The aim of peer review is to make sure the work is of a high standard. By using these suggestions you are creating the best version of your article. If your article was rejected look at the feedback you were provided and check to see if you met the author guidelines for the journal. You might have go back and rewrite your article.