The word radio comes from the Latin '' radius ''. It is a means of communication that has managed to remain in force for decades despite the manifestation of more sophisticated competitors, such as television and digital content in general.
The Radio as a medium of communication and entertainment massive came into existence since 1920 in the United States and Argentina, as a set of devices to transmit voice and music, making them accessible to people, this is a process wavelet transform of original radio signals in another type of growth so that you can send the signal to them at a distance.
The radius is an element that can be called '' social communication '' because it has the possibility of contacting large social groups. There are also different types of radio such as commercial radio, public radio, community radio.
The commercial radio is a radio station owned by a commercial entity specializing in music and Portugal is one of the first stations in Portugal that transmits real - time news.
The community radio, rural radio, cooperative radio, participatory radio, free radio, alternative, popular, educational is radio transmission and networks of groups that have been created with the intention of favoring one community or population center, whose interests they are the development of the community.
Public radio is an essential service and the nucleus of democratic societies whose objective is the production, edition and diffusion of a set of radio channels covering all genres and destined to satisfy the information needs.
