A television is a machine with a screen. Televisions can usually receive broadcast signals and turn them into pictures and sound. The word Television comes from the word tele (Greek word 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 more varied. Some TVs can fit in your hand and run with batteries. Other TVs can take up a whole wall in a house, and may sit on the floor, or be just a large, flat screen that can be put on the wall.
All TVs have screens where the picture is viewed. Before the 1970s these were usually black and white, which made everything look gray.But now almost all TVs show colours. All TVs used to be made with cathode ray tubes. These are like heavy glass jars with one side facing out to make the screens. Today there are also Liquid Crystal Display, plasma, rear projection and organic light emitting diod (OLED) TVs.