Aperture, Shutter speed, and ISO form the three basic building blocks of an image. If you want to capture beautiful pictures, you need to control these 3 parameters according to the available lighting. In this guide, we will see the role of ISO in photography in detail. How ISO impacts an image? I will also share the different ISO values that you can use in different situations. If you are a beginner in photography, you will find this guide very useful.