Natural light is anything that occurs without human intervention, so it can be the direct light of the sun on a bright day, the diffused light created by a cloudy or foggy day, or even the light of the moon at night.
There are two main kinds of light: natural and artificial. Natural light is anything that occurs without human intervention, so it can be the direct light of the sun on a bright day, the diffused light created by a cloudy or foggy day, or even the light of the moon at night. On the other side of things, artificial light can often be moved around and adjusted to fit your situation. It is easier to position artificial light in relation to your subject than with natural lighting, where you would have to move the subject and camera according to the lighting technique that you want to use. Both artificial and natural lighting can be manipulated to create any number of styles of lighting, as long as you know how to use them.