ISO Sensitivity controls the amount of light that gets captured for photos taken. This is the same as the exposure rate in analog/film based cameras. In analog cameras the amount of light captured in the film is controlled by the duration of time the shutter is open for one click (exposure rate). In digital cameras, this is controlled by setting the ISO Sensitivity level of the cells that capture the incoming light upon click.
During bright light conditions, a lower ISO sensitivity is preferred and a higher sensitivity in dark conditions.
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