What are the different types of shadows?

There are mainly three types of shadows: umbra, penumbra, and antumbra. The umbra is the darkest part of the shadow where the light source is completely blocked. The penumbra is the lighter part that surrounds the umbra, where the light source is partially blocked. The antumbra occurs when the light source is larger than the object blocking the light, creating a shadow that appears to be lighter and more diffuse.