Television or TV is a telecommunication medium used for transmitting sound with moving images in monochrome (black and white) or incolor and in two or three dimensions. It can reger to a television set, atelevision 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 1920. After world war LL. an omproved form became popular in the united states and Britain, and television sets became commonplace in homes, businesses, and institution. During the 1950 television was the primary medium for influencing public opinion. In the mid 1960 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 2006 enabled viewers to watch prerecorded material such as movies. At the end of the first decade of the 2000, digital television transmissions greatly increased in popularity. Another development was the move from standard definition television SDTV 576i, and 576 interlaced lines of resolution and 480 to high definition television HDTV which provides a resolution that is substantially higher HDTV may be transmitted in various formats; 1080p, 1080i and 720p. Since 2010 with the invention of smart television internet in various television has increased the availability of television programs and movies via the internet through services such as Netflix Iplayer Hulu Roku and Chromecast.
In 2013 79% of the world's housholds owned a television set. The replacement of early bulky, high voltage cathode ray tube CRT screen displays with compact energy efficient flat panel alternative technonogies such as plasma displays LCD. Major manufactures announced the discontinuation of CRT, DLP plasma, and even fluorescent backlit LCD by the mid 2010, LED are expected to be replaced gradually by OLED in the near future. Also major manufacturers have announced that they will increasingly produce smart TV sets in the mid 2010. Smart TV with integrated internet and Web 2.0 functions became the dominant form of television by the late 2010.
Television signals were initially distributed only as terrestrial television using high powered radio frequency transmitters to broadcast the signal to individual television receivers. Alternatively television signals are distributed by coaxial cable or optical fibre, stellite systems and via the internet. Until the early 2000 these were transmitted as analog signals but countries started switching to digital, this transition in expected to be completed worldwide by late 2010. A standard television set is composed of multiple internal electronic circuits, including a tuner for receiving and decoding broadcast signals. A visual display device which lacks a tuner is correctly called a video monitor rather than a television.