A more thorough explanation:

A peer-reviewed journal is a type of publication that follows a process of sending submitted articles to experts who are not involved in the research. These experts review the articles to ensure that they are reliable and meet scholarly or scientific standards. Articles that pass this review process are then published in the journal.

For example, if a researcher submits an article to a peer-reviewed journal, the journal's editors will send the article to other experts in the same field. These experts will review the article and provide feedback to the editors. If the article meets the journal's standards, it will be published in the journal.

Another example is the Journal of the American Medical Association (JAMA), which is a peer-reviewed journal that publishes articles related to medicine and health. Before an article is published in JAMA, it goes through a rigorous review process by experts in the medical field to ensure its accuracy and reliability.