The word "backlight" refers to the light that shines behind an object or screen. It helps illuminate the object or screen from the back to make it easier to see. Full definition
Both offer HD playback on very good sized, 16:9 aspect widescreen displays and neither make the promise of any kind of LED backlighting of super contrast or colour gamut action. (pocket-lint.com)
The keys have ample spacing and make a satisfying click while you type, and there are three levels of backlight for when you're working in the dark. (windowscentral.com)