Increasing your camera's ISO setting improves its ability to see in the dark, but it can also lead to artifacts in your images that look like millions of tiny dots, known as noise. But where exactly does it come from?

Dylan Bennett breaks it down for you in this 10+ minute clip which explains how your camera's sensor works, where that noise is coming from, and why boosting the ISO setting can make your images unfortunately look like they were taken in a snowstorm, if you over do it. [YouTube via PetaPixel]