What is LED backlit display?

What is LED backlit display? A laptop vendor told me that some laptops have led-backlit display which is superior to normal display. What exactly is the difference? Is it better to opt for backlit display? Is it better for the eyes?
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Guest [Entry]

"an LED backlit display is a display that uses LEDs to illuminate the display so it can be seen. If you have ever seen the back light go off on a cell phone and then noticed the image remain then you know what I am talking about. The LED is a good source of light as long as it is used with an opaque diffuser to eliminate noticeable differences in intensity.

The display itself produces color and light separately in most cases. The color is produced on one layer and the back lighting is produced on another."