Credibility refers to the quality of being trusted and believed in. It is essential in various fields, such as journalism, science, and education, where accurate information is crucial. A credible source is one that provides reliable and well-supported information, often backed by evidence or expert opinion. Factors that contribute to credibility include the author's qualifications, the quality of the evidence presented, and the reputation of the publication or organization. For example, a study published in a reputable journal, like The New England Journal of Medicine, is generally considered more credible than an unverified blog post.