What is ISO?
In Film photography, ISO (or ASA) indicated how sensitive the film was to light. It was measured in numbers, the lower the number the lower the sensitivity of the film and the finer the grain in the shots you're taking.
In Digital photography the ISO measures the sensitivity of the image sensor. The ISO are generally used in darker situations to get faster shutter speeds.
What is Aperture?
Aperture is the opening of the lens, the aperture you set implicates the size of the hole on the lens. The larger the hole the more light gets in - the smaller the hole the less light gets in.
What is Shutter Speed?
Shutter speed is measured in seconds - or in most cases, fractions of seconds. It is the length of time that the image sensor is exposed to the scene you are photographing. Long shutter speed is useful in low light situations, where as fast shutter speed is useful when capturing something that is fast moving or in high lighting.
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