The World Factbook is produced annually by the U.S. Central Intelligence Agency (CIA). Profiles can be selected by country and provide information on the history, people, government, economy, geography, communications, transportation, military, and transnational issues for 267 world entities. Additional reference tabs cover such content as maps of major world regions, flags of the world, and a useful guide to country comparisons. The Factbook is available for free download in compressed, .zip file format.