What you mean by ISO

ISO in film is used to refer to the "speed" of the film. The lower the number, i.e. 25, 100, 200, the "slower" the film. Slower film requires more light for a longer time to capture the image on the film. The faster the film, the better it works in low light. As a trade off, the slower films have more grain, so they can enlarge much larger. If you try to take a faster film, such as 1600, any larger than 5x7, you'll see grain, it will look like it was printed on sand paper. With digital cameras, that's not the issue. You can enlarge a photo shot at ISO 1600 just as large as one shot at 100. That's because the sensor has the same number of dots regardless. So, all it really affects is the sensitivity of the sensor. When you shoot at ISO 1600, the sensor will use less light to grab the image, but will have to "guess" at some of the dots. Thus the red, greens and blues scattered throughout the blacks, and sometimes the whites. But, when you are in low light, you need that higher setting. Actually, ISO is only a true term in film. It was only carried over to digital because its a term photographers were familiar with.

Well I know ISO is for standards in the industry and the only iso's I know about are the ISO Speeds of Digicams and I know only about them that the higher the iso speed of your cam is the less time it needs to catch the light for a picture but as exchange you get with higher iso speed more iso noise, and that's the red blue and green spots on the dark areas.