Print, broadcast, and new media are the three basic types of media. Print media includes books, newspapers, magazines, posters, brochures, and press releases. Broadcast media refers to radio and television transmission of audio and audiovisual signals. Newspapers are a reliable source of local, national, and international news stories, opinions, sports, entertainment, and classified ads. Radio broadcasting evolved from wireless telegraphy to include commercial radio stations and a variety of programming formats. Television broadcasting transmits both audio and video and includes formats such as news, talk shows, dramas, sitcoms, and educational programs.