Periodicals are publications that are released on a regular schedule, such as weekly, monthly, or quarterly. They include a variety of formats, including magazines, journals, and newspapers, and cover a wide range of topics from news to academic research. These publications are essential for disseminating information and keeping readers informed about current events, trends, and scholarly advancements. Periodicals often feature articles, reviews, and advertisements, making them a valuable resource for both casual readers and professionals seeking in-depth knowledge in specific fields.