Why do cat's eyes glow in the dark?

They glow because of a natural part of the eyes that lets cats see better at night. Cats have a part of the eye called the tapetum lucidum. It is at the back of the eye and reflects light like a mirror, allowing the cat's eyes to capture more light than people can - meaning they see much better even with lower levels of light. This little "mirror" reflects light so that you can see it as well - causing the cat's eyes to look like they are glowing. Really, you are just seeing a reflection of the available light coming off of the cat's eyes. 

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