For the remedial's who will most likely apply this to made up manufacturing quality standards ratings in not fully understanding it was originally used to rate the suitability of drinking water and nothing more, not the quality of manufactured products. (such is the influence of China). 

The ISO settings in camera's has absolutely nothing to do with the a fore mentioned convoluted and miss-understood meaning when talking about camera settings. Originally when talking about cameras ISO ratings and settings, we're referring to something that is used to measure film speed exposure as film tended to have different levels of sensitivity to light. Altering the films speed levels on a camera allowed for different levels of light exposure to have different effects on the image recorded to the film, but since we don't use camera roll film anymore in digital camera's I guess we could think of it the sensor exposure speed instead.

There also seems to be some miss-conceptions that low ISO settings aren't a good thing, which is true in very low light conditions in combination with very short exposure times. Generally though whilst in very well lit situations in combination with the appropriate exposure times, a low ISO setting will most certainly help to enhance the clarity and sharpness of an image with the appropriate physical optics permitting in combination with the appropriate distance of the focal point. A lot of D-SLR's get down to about 100, some higher end models even go down to ISO 50. But for most people its not something that they think about when using a compact point 'n' shoot (which make up the vast majority of camera sales) as it pretty much does everything for you. But its just something to bare in mind if you fancy experimenting with some manual exposures to try and achieve some slightly off beat effects or just some clearer, cleaner, sharper snaps with the appropriate lighting whilst in manual. Here's a few examples of snaps taken a few years ago at ISO 80 or 100 in the mid day sun using a now long time missing (and also long discontinued) 80iXUS.