What effect does increasing the ISO setting have on a digital photograph taken in low light?

Increasing the ISO setting in a digital camera enhances the camera's sensitivity to light. This adjustment is particularly beneficial in low-light conditions, as it allows for better exposure without requiring longer shutter speeds or wider apertures. Higher ISO settings enable the sensor to capture more light, which results in a brighter image.

While increasing ISO helps to maintain a good exposure in darker environments, it is important to note that this can also introduce noise into the image, which can degrade overall quality. Nonetheless, the primary effect of increasing ISO is indeed the increased sensitivity to light, making it easier to capture images in challenging lighting situations.