Broadcast Media - What are these?

Broadcast Media
Personal communication media include unpublished writing, a telephone or facsimile message, a snapshot for the fam­ily photo album, a tape recording mailed to a friend, or even a home video. All communicate through time and space, but none involves the masses.
Mass media include television, radio, newspapers, magazines, books, recordings, and film. These are media intended for the pub­lic, for the masses. You can write a letter (a personal medium) to a magazine that can become a mass medium if published in the letters column. In other words, one medium can become the con­tent of another. For example, a record or compact disc can become the content of a mass medium, such as a radio program. A photograph or film can be content for a television show.
Broadcast media are, specifically, radio and television. Broadcasting means using electric signals to reach a large audi­ence. The word broadcast is borrowed from agriculture where it originally meant a way of hand-sowing grain or seeds by casting them broadly instead of planting one at a time. The telephone is a communication medium but it is neither a mass medium nor broadcasting. A telephone conversation is a personal medium, not "cast broadly" for the masses. Since most phone messages are car­ried through wires, not by radio waves, it is not broadcasting. But if that telephone conversation is part of a call-in radio show, that is broadcasting. Radio is the mass medium used to broadcast the telephone conversation.
A ship-to-shore radio telephone conversation is not broadcast­ing, nor is a call from a portable phone. Both use radio or microwaves to carry messages, but neither is intended for mass reception. The mass media of broadcasting today include television and radio. Cable television, strictly speaking, is not broadcast­ing because wires are used to carry the programs to specific households.
New technology has made the distinction of broadcast media difficult to maintain. The word telecommunications is often used to include any communication by means of radio waves, electron­ic signals, wires or cables, fiber optics, microwaves, or satellites.