backlit keyboard

I did a lot of research, but have not found the answer. So, any one can give a introduction what is backlit keyboard.

thank you.

 

You are asking, What a backlit Keyboard is?

A keyboard with lights behind the keys, so in the dark, you can see your keyboard.

... http://images.google.com/images?q=b...ent=firefox-a&um=1&ie=UTF-8&sa=N&hl=en&tab=wi

 

Its this:

 

got it, thank ahl395 and optimustarzan.

 

no problem.