Periodicals are usually published in a specified period, by volume, issue, year, month, etc. And their contents are usually systematic and professional, including many types of articles, such as research papers, reviews, news, reports, etc. Periodicals usually have a fixed publishing cycle, such as monthly, bimonthly or quarterly.
Publication refers to a kind of publication, including magazines, newspapers, books and so on. , which can be published regularly or irregularly. The contents of publications are usually extensive and can cover many fields, including news, reviews, novels, poems, essays, cartoons and so on. Publications usually have no fixed publishing cycle and can be published at different time intervals such as monthly, quarterly and annual.