Television or TV is a telecommunication medium used for transmitting sound with moving images in monochrome or in color, and in two or three dimensions. It can refer to a television set, a television program, or the medium of television transmission. Television is a mass medium, for entertainment, education, news, and advertising.
Television became available in crude experimental forms in the late 1920s. After World War II, an improved form became popular in the United States and Britain and television sets became commonplace in homes, businesses, and institutions. During the 1950s, television was the primary medium for influencing public opinion. In the mid-1960s, color broadcasting was introduced in the US and most other developed countries. The availability of storage media such as VHS tape (1976), DVDs (1997), and high-definition Blu-ray Discs enabled viewers to watch prerecorded material such as movies.