A periodical is a publication that is released at regular intervals, such as daily, weekly, monthly, or quarterly. Examples of periodicals include magazines, journals, and newspapers. They often focus on specific subjects or themes, providing readers with updated information, research, or entertainment. Periodicals are valuable resources for researchers, students, and the general public. They typically include articles, reviews, and advertisements, and may feature contributions from various authors. Well-known periodicals, like The New York Times or National Geographic, serve to inform and engage audiences on a wide range of topics.