When talking about digital ISO it is sometimes helpful to think of digital ISO/sensitivity as film speed. When a non-digital camera is used, the user must load film into the camera. This film has different ISO/ASA numbers. Typical ISO numbers are: 50, 100, 200, 400, 800, 1600. The higher the ISO number, the more sensitive the CCD is to light - which means pictures can be made in lower light situations. The lower the ISO number, the less sensitive the CCD is to light - good for sunny days. The difference between film ISO and digital ISO is that you can change the ISO for each frame on a digital camera whereas you have to shoot an entire roll of film before you can change the ISO.
*On a side note - the higher the ISO the more noise (digital camera) or grain (film camera) you will see in the photograph.
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