Explanation:

A shadow is a dark outline or shape that is formed when an opaque object blocks the path of light. When light from a source, such as the Sun or a lamp, encounters an opaque object, it cannot pass through it. Instead, the light is blocked, and a shadow is created on the opposite side of the object.

Key Points:
- A shadow is formed when an opaque object blocks light.
- The shadow appears on the opposite side of the object in relation to the light source.
- Shadows are usually darker than the surrounding area because less light reaches them.
- Shadows can have different shapes and sizes depending on the shape and position of the object.
- Shadows change throughout the day as the position of the light source, such as the Sun, changes.
- Shadows can also be created indoors when objects block artificial light sources like lamps or candles.

Example:
For example, if you stand in front of a lamp, your body blocks the light from reaching the wall behind you. As a result, a shadow of your body is formed on the wall. The shape of the shadow will resemble the outline of your body, but it will appear as a darker area compared to the rest of the wall.

Importance:
Shadows play an important role in our understanding of the world around us. They help us determine the shape, size, and position of objects. Shadows also give us information about the direction and intensity of light. Artists use shadows to create depth and dimension in their artwork, and scientists study them to learn more about the behavior of light. Shadows are a natural phenomenon that can be observed in various situations and locations, making them an interesting and fascinating aspect of our everyday lives.

A shadow is a dark outline of an opaque object that blocks light coming from a source.