In most cases we can make use of natural or available / ambient light but we must be aware of different kinds of natural light and learn how to exploit it thoughtfully and creatively.

Natural Lighting :

Natural light refers to the ambient light supplied by the sun or moon, not a camera flash or other artificial light sources. Natural light is also taken to include lights you’d find naturally in the environment, such as street lights, lamps, etc.

Ambient lighting :

Ambient light is any light a photographer or cinematographer did not bring to the shoot. Also known as available light, it’s any light that you haven’t set up yourself.