Academic journals introduce and present new research material, as well as critiques of existing research. Written by researchers and scholars, the articles published in these journals are peer-reviewed. That means academic professionals assess and edit them. Academic articles are usually structured to include a literature review, an explanation of the research method, data used, a conclusion, footnotes and a bibliography. Academic journals are available in electronic form (often through a paid online subscription) or in a printed book format.
Trade journals provide news and updates to professionals in a particular industry. These publications feature articles, photographs, illustrations and advertisements that appeal to professionals in the field. Trade journal articles are usually not peer-reviewed by experts, but many include bibliographies and specialized jargon like academic articles. The writers and content creators are often staff members, but industry professionals may contribute to these publications. You can find many trade journals in both electronic and print form.
Literary journals compile original poetry, essays, short stories and artwork, as well as book reviews and publishing industry news. Some literary journals focus on a specific genre -- westerns, horror, romance --- while others publish a variety of topics. Literary journals also differ on how they select content. Some journals accept works from professional writers and artists. Others accept submissions from first-time writers and amateurs. Many literary journals in the 21st century now feature their content on web sites and blogs. However, print versions are still available and commercially viable.
Popular journals appeal to a wider audience. These publications have less technical jargon and rely heavily on visual content -- glossy, colorful photographs and advertisements. Popular journals inform the general public on topics ranging over politics, economics and popular culture. Staff editors evaluate popular journals; they're not necessarily experts in the field. Unlike academic, literary and trade journals, these publications carry well-known names and enjoy strong sales as a result. Newsweek, Rolling Stone, Time Magazine and Reader's Digest are some examples.