Indexes help us to find articles in journals, magazines and newspapers. A journal publishes scholarly, usually lengthy articles on very specific topics. Abstracts or summaries are often included. The authors are specialists in their field of study.
Articles describe original research and the information is verifiable.
Bibliographies are included. Magazines are written for a general audience and contain articles on popular topics. They are mostly written by staff writers, not always identified. The information is not always verifiable. An index is a collection of citations to articles listed alphabetically by subject.