<human>:  What is the difference between an LCD and LED TV?
<bot>: The main difference between an LCD and LED TV is the type of backlight used. An LCD TV uses cold cathode fluorescent lamps (CCFLs) as a backlight, while an LED TV uses light-emitting diodes (LEDs) as a backlight. LEDs provide a brighter picture than CCFLs, but they are also more efficient and use less power. Additionally, LED TVs can be thinner and lighter than LCD TVs since the backlight system is much smaller.