Tolong jelaskan mengenai Penerbitan berkala dari Penerbit dalam bahasa melayu

Nominally, periodical publishing involves publications that appear in a new edition on a regular schedule. Newspapers and magazines are both periodicals, but within the industry, the periodical publishing is frequently considered a separate branch that includes magazines and even academic journals, but not newspapers.  About one-third of publishers in the United States publish periodicals (not including newspapers).