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A periodical is  published at regular intervals (daily, weekly, monthly...) in a series throughout the year .  On the Web it can be hard to distinguish the difference.

	Journal (scholarly): includes articles written by scholars in an academic or professional field, which are often peer reviewed.
	Magazine (popular):  includes articles about diverse topic of general interest and current events. Usually these are written by journalist and geared toward the general public.
	Newspaper (popular): includes articles about current events usually published daily.

Academic/Scholarly Journal Articles:

• are written by experts (professors and researchers).
• are intended to be read by other professors, researchers and students.
• use specialized or technical vocabulary for the field.
• include a lengthy list of references (citations).
• are longer and focus more in-depth on research.
• have little or no advertising.

Popular Magazine Articles:

• are written by journalists.
• are intended to be read by the general public.
• use language understood by most readers.
• rarely include citations for their sources.
• are shorter and general in focus.
• have a lot of advertising.

Examples of Scholarly Journals:

• IEEE Computer Science
• Journal of Hazardous Materials
• Journal of architectural engineering
• Nature

Examples of Popular Periodicals:

• Wired
• Scientific American
• Business Week
• Advertising Age, a trade magazine
• New York Times, a newspaper