A periodical literature is a published work that appears in a new edition on a regular schedule. The most familiar example is a newspaper, but a magazine or a journal are also examples of periodicals. These publications cover a wide variety of topics, from academic, technical, trade, and general interest to leisure and entertainment.

To publish is to make content available to the general public. While specific use of the term may vary among countries, it is usually applied to text, images, or other audio-visual content, including paper. Publication means the act of publishing, and also any copies issued for public distribution.