Sorry for the stupid question but what is Razer Chroma?

I love my Razer mechanical keyboard for typing and how it looks. I somehow acquired a collection of keyboards (Logitech, etc.), but I've got a Razer hooked up now because I like how it types. I don't think I would get one just for the Chroma feature, though. It's cute, but it's not much ... Sometimes, I don't even bother turning it on. I think how a keyboard types should be its most important feature.

I'm not patching my game just yet, so I don't know the Sims works with it.