This article offers the results of the investigation project about the “State of the art, generation and use of the knowledge on terrestrial digital television (TDT) in Colombia” during the year 2009. The terrestrial digital television is defined as: the application of the new technologies of the digital media for television emission through a conventional aerial. Using these new methods it is obtained bigger possibilities, as providing a bigger number of channels; more interaction; better image quality; and sound of high definition. Methodologically, is shown a examination to the state of the art with respect to terrestrial digital television in the world and it is exposed arguments about the