My definition of ISO

So I was told to post my definition of ISO on my blog so yaaa....ISO is basically just how sensitive the camera is to light. On your camera, you can go to ISO and choose from a set of numbers. The higher the number, the lighter the picture will be; the lower the number, the darker obviously. When you choose a higher number, you want to be careful because when you upload your picture, it can turn out really pixelated and unfocused. Most people tend to use the lower ISO during the day.