Broadcasting refers to the distribution of information (especially when transmitted by electromagnetic transmitters or via electrical and optical cables). Specifically, broadcasting means sending a message (for example a radio or TV signal, or digital information) to all receivers in some domain (for example, all receivers in range of a radio transmitter or all computers in a network). Related terms are unicasting (where a message is sent to a single receiver), and multicasting / narrowcasting (where information is sent to specific groups of receivers, such as members of a mailing list or subscribers to a cable
channel). Find suppliers contributing products and services relating to the distribution of video and/or audio content. Typically one thinks of public and commercial television or radio stations but broadcasting covers most forms of communication including morse code and most wireless technologies.