A circular is just a letter that contains crucial information and is circulated to a wide number of individuals. A circular must always reach a big number of correspondents, whether for inter-departmental communication, advertising, or even personal reasons... The first official circular was sent from King Charles II to his loyal subjects during the English Restoration. It told them what government measures were being taken to ensure peace after the recent royalist victory over the Parliamentarians in the Civil War. It read: "We command that no person within this kingdom shall engage in any military action against us or our allies." This means that people should not join army campaigns or support others who do. The message was intended for everyone, so it was published in a newspaper that would have reached all parts of the country. It's a mass medium because it can be read by many people at once. Circulars often include instructions on how to respond if you receive something that identifies someone who has gone missing, such as a "John Doe" notice. These responses are called "tags". They can also contain information about future actions, like news stories. People want to know what's happening in the world around them and news agencies sell space for circulars to publish important news stories.