Periodicals are published on a regular basis. Examples are journals, magazines, newspapers and trade publications.
- Journals are specialized periodicals with generally long authoritative articles aimed at a professional audience. They are usually published quarterly or annually and most are peer reviewed.
- Magazines are more popular and often contain short articles and lots of advertising. They are geared to the lay person or casual reader.
- Newspapers are serial publications, usually printed on newsprint and generally issued daily or weekly, containing news, editorial comment, columns, advertising, comics, etc.
- Trade Publications are serials that focus on industry, product and business information in a magazine or newspaper format.
- Newsletters are short publications usually with very specialized focus. They are generally inexpensively printed and published. They are often full of editorializing. They are often published to support a special cause.
- Peer Reviewed articles are reviewed by individual experts or a panel of experts prior to being accepted for publication.