"Backlit keys" refers to keys on a keyboard or other device that light up from behind, allowing you to see and use them in low-light or dark environments. Full definition
The Razer BlackWidow Chroma V2 features individually programmable backlit keys with 16.8 million color options, all easily set through Razer Synapse. (razer.com)
It now boasts all - round gaming performance with individually backlit keys, so you have more room for customization. (razer.com)
What's not optional is the ASUS Transformer Cover Keyboard, which features backlit keys with laptop - like 1.4 mm travel and comes in a variety of colors including Stone, Charcoal, Taupe, and Amber. (mobilegeeks.com)