Television history and application

Television, system of sending and receiving pictures and sound by means of electronic signals transmitted through wires and optical fibers or by electromagnetic radiation. These signals are usually broadcast from a central source, a television station, to reception devices such as television sets in homes or relay stations such as those used by cable television service providers. Television is the most widespread form of communication in the world. Though most people will never meet the leader of a country, travel to the moon, or participate in a war, they can observe these experiences through the images on their television.
Russian-American electronic engineer Vladimir K. Zworykin transmits a series of basic patterns on a screen as he demonstrates the first all-electronic television system in 1923 year. But only much later were these concepts applied to television as it is known today. The first practical television system began operating in the 1940 year.
Television has a variety of applications in society, business, and science. The most common use of television is as a source of information and entertainment for viewers in their homes. During the 1930s, several companies around the world were actively preparing to introduce television to the public....

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