What does the camera ISO automatic mean?

Auto in digital camera is fully automatic mode, also called fool mode. If you don't know anything about digital cameras, you can basically take 80% successful photos with this mode. Automatic mode corresponds to professional mode, and there are the following modes: 1.a mode, and aperture takes precedence. 2s mode, shutter priority. 3.p mode, program mode, that is, the combination of A and S 4.m mode, all manually set. All shooting parameters are completely determined by the camera, and users only need to view, compose and press the shutter. Although this kind of shooting is not necessarily reasonable in parameter setting, it can still take good photos without being too complicated. Only in extreme cases can movies be unsatisfactory.