Outdoor light comes in many different forms. The sun being the most obvious. The moon and stars. Don't forget street lights and flood lights too. But mostly, when we think of outdoor light we think of the sun.
Conditions can be hazy to bright or very overcast almost dark.
The sun can be partly obscured by the clouds or it can be directly overhead which can make it difficult to take pictures of people because of unflattering shadows. Let's talk about the some different types of Outdoor light. Days when it is Sunny with no clouds in sight can be good or bad depending on what you are photographing. If you are photographing people and you want to be able to see their faces, keeping the sun somewhere behind you is a good idea. It doesn't have to be directly behind you.