A PERIODICAL is a publication which is issued at regular intervals – daily, weekly, fortnightly, monthly, quarterly etc. The articles in a periodical provides more concise, current and focussed information. They have a variety of purposes and can include news, opinions reviews, scholarly analysis and research. PERIODICALS are divided into two categories: General or Specialized.
General periodicals, also called MAGAZINES, have articles on many subjects, are usually written in popular style for general public. Articles are written by professional writers with or without expertise in the subject; contain "secondary" discussion of events, usually with little documentation (e.g. footnotes). Magazines use vocabulary understandable to most people, and often have lots of eye-catching illustrations. Time, Newsweek are magazines.