Use simple language in order to meet minimum education level. Includes photographs, illustrations and graphics to enhance the publication. Photographs, illustratons, drawings to enhance publication. Occasionally cite sources, but this is the exception, not the rule. Rarely cite any sources.
Original sources can be obscure.
To inform, report, or make available original research or experimentation to the rest of the scholarly world. Provide special information to a wide, interested audience. Designed to entertain or persuade. Generally published by commercial enterprises for profit. Published for profit.