Quick Answer: An editorial calendar, or publishing schedule, is used by bloggers, publishers, businesses, and groups to control publication of content across different media, for example, newspaper, magazine, blog, email newsletters, and social media outlets. Publishers also extract some of their editorial calendar data and make the data publicly available to attract advertisers. Public relations professionals also use these abbreviated editorial calendars to try to place stories for their clients. However, the primary purpose of editorial calendars is to control the publication of content to ensure regular appearance of content that interests readers and advertisers. Traditional print publishers have used editorial calendars in some form for centuries to manage the publication of books, magazines, and newspapers. The internet has dramatically increased the number of publishers, who also need to organize content and ensure content is published at regular intervals.