A flat-screen TV is a type of television that uses a thin, flat display technology instead of the traditional cathode ray tube. The most common type of flat-screen TV is the LCD (liquid crystal display) or LED (light-emitting diode) TV. The term 'flat-screen TV' can also refer to PLASMA TVs, which use a different type of display technology. PLASMA TVs are typically larger than LCD and LED TVs, making them ideal for larger rooms or home theaters.