What is Broadcasting?
[[File:WTUL Microphone.jpg|right|220px]] In [[communications]], such as [[radio]] and [[television]], '''broadcasting''' means sending information such as television shows or music [[electronics|electronically]] to a large audience. The information is sent through the air in [[radio waves]], through a [[coaxial cable|wire]], or by a [[communications satellite]], and then the television viewers or radio listeners pick up the signal using their television sets and radio receivers. [[Gugliemo Marconi]] invented wireless [[telegraph]]y, in December 1901 he transmitted first radio signals across the [[Atlantic Ocean]]. This was point to point. Experiments with voice broadcasting began a few years later, and it grew rapidly in the 1920s. ==Types of broadcasters== Different broadcasters use different radio waves and different modulating methods. [[amplitude modulation]] on medium waves was the first to be much used. Some [[television network]]s are said to be broadcasting, even if they are only or mainly on [[cable TV]] rather than by radio waves. === Public broadcasters === Many countries have [[Public broadcasting]], using money from the government to broadcast television shows and radio programs. Examples include the [[BBC]] in [[Britain]], [[NHK]] in [[Japan]], and the [[CBC]] in [[Canada]]. In the [[United States]], most public broadcast radio and television stations are run by educational groups (such as colleges or universities) or by a state's educational department. Public broadcasters, by law, cannot accept or display commercial [[advertising]]. However, businesses can make [[donation]]s to a public broadcaster. Most are part of the [[Public Broadcasting System]]. [[PBS]] is different than the other public broadcasters such as [[BBC]], [[NHK]] and [[Canadian Broadcasting Corporation|CBC]], because the PBS gets a lot of its funding (money) from donations by viewers and listeners. Public broadcasters make programs that the private companies are not interested in making, such as educational childre