Editor’s note: This explainer is part of Frequency of Deception / Radiofrecuencia de engaños, a six-part series by Feet in 2 Worlds in partnership with WNYC’s Notes from America, palabra and Puente News Collaborative on the spread of dis- and misinformation on Spanish radio in the U.S. This article is part of U.S. Democracy Day, a nationwide collaborative on Sept. 15, the International Day of Democracy, in which news organizations cover how democracy works and the threats it faces. To learn more, visit usdemocracyday.org. This story first appeared on palabra, the digital news site by the National Association of Hispanic Journalists.