A television (also TV, telly or tube) is a machine with a screen. Televisions receive broadcast signals and turn them into pictures and sound. The word "television" comes from the words tele (Greek for far away) and vision (seeing).
Sometimes a TV can look like a box. Older TVs had large wooden frames and sat on the floor like furniture. Newer TVs are much lighter and flatter. A television can show pictures from many places. At first, all televisions used an antenna (or aerial). This would pick up shows from broadcast television stations. A TV station could be many miles away, and still be picked up. TVs can also show movies from VCD and DVD players or VCRs. Cable TV and Satellite television can provide more programs at once than broadcast can. Video game consoles connect to most modern TVs. Some computers can also use a TV as a monitor.
All TVs have screens where the picture is viewed. Before the 1970s these were usually "black and white", which made everything look grey, but all modern TVs show colors. Screens also used to have rounded corners, but now they are usually flat rectangles with straight edges. It is a wider rectangle that looks more like the shape of a movie theatre screen. This is called widescreen. If a widescreen set was 30 cm tall, it would be 53 cm wide. For this to work best, TV shows also need to be made in widescreen. Widescreen sets can still be any size, but they have the same widescreen shape.
All TVs used to be made with cathode ray tubes. These are like heavy glass jars with one side facing out to form the screen. Today there are also Liquid crystal display (LCD), Plasma, rear-projection, and organic light-emitting diode (OLED) TVs.
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