Trade
Target audience is people who work in a particular trade, business and industry. Keeps it's readers abreast of new developments. Trade publications include targeted advertising, which earns a profit for the publication and sales for the advertisers. The advertising content is mainly centered on the industry in question.
Contain news, trends, developments, and new products in industry or profession. Often written and intended for professionals and experts in a field. Articles focus on technical and practical aspects of a specific field. Only few references if any.
Sensational and tabloid
Sensational periodicals come in a variety of styles, but most often use a small newspaper format. "Tabloid" newspapers have been a staple in the U.S. since the 19th century.
Sensational and tabloid publications use elementary, inflammatory language meant to arouse curiosity, cater to popular superstitions, increase sales, and promote the publisher's political agenda. They often do so with flashy headlines designed to astonish or by falsely reporting on domestic and international events.
Emphasizes on sensational crime stories, gossip columns about celebrities and sports stars, junk food news and astrology. Usually focus on rumors about the private lives of celebrities.
News and General interest
These periodicals may be quite attractive in appearance, although some are in newspaper format in their printed versions. Articles are often illustrated, generally with photographs.
News and general interest periodicals sometimes cite sources, though more often do not.
Articles may be written by a member of the editorial staff, a scholar or a free lance writer. The author information is called a byline in news sources.
The language of these publications is geared to any educated audience. There is no specialty assumed, only interest and a certain level of intelligence.
They are generally published by commercial enterprises or individuals, although some emanate from specific professional organizations.
The main purpose of periodicals in this category is to provide information, in a general manner, to a broad audience of concerned citizens.