Radio is the technology of using radio waves to carry information, such as sound, by systematically modulating properties of electromagnetic energy waves transmitted through space, such as their amplitude, frequency, phase, or pulse width. When radio waves strike an electrical conductor, the oscillating fields induce an alternating current in the conductor. The information in the waves can be extracted and transformed back into its original form.

Wikipedia

Television

Television (TV) is a telecommunication medium used for transmitting moving images in monochrome (black and white), or in colour, and in two or three dimensions and sound. The term can refer to a television set, a television program ("TV show"), or the medium of television transmission. Television is a mass medium for advertising, entertainment and news.

Wikipedia

Press

Whenever the press quits abusing me I know I'm in the wrong pew. I don't mind it because when they throw bricks at me—I'm a pretty good shot myself and I usually throw 'em back at 'em.

Harry S. Truman, speech at a dinner in his honor, Washington, D.C., February 22, 1958.—Text as recorded by The New York Times, February 23, 1958, p. 46.

Wikiquote

Television

Thanks to TV and for the convenience of TV, you can only be one of two kinds of human beings, either a liberal or a conservative.

Kurt Vonnegut, in Cold Turkey at In These Times (10 May 2004)

Wikiquote

Press

To the press alone, chequered as it is with abuses, the world is indebted for all the triumphs which have been gained by reason and humanity over error and oppression.

James Madison, "Report on the Resolutions", in Gaillard Hunt, ed., The Writings of James Madison vol. 6 (1906), p. 389. This report of the resolutions of the Virginia House of Delegates in 1799 was submitted by a committee headed by Madison and is widely known as the Virginia Report of 1799.

Wikiquote