What is the best definition of "a shadow" that my 3 and 4 year olds could understand?

lol when u look at the wall u see a drawing of urself that is called ur shadow so basically that's its name just like if they have an imaginary friend this is something like it its a reflecTION

does that work?lol

A shadow is created when something blocks light. When the light from a bright source, like the sun, shines on an object, it cannot pass through that object. This creates an area behind the object where the light cannot reach, and that area is called a shadow. So, a shadow is like a dark shape that appears on the ground or on a wall when something comes in between the light and that surface. It's like a patch of darkness that follows the shape of the object blocking the light. You can show your 3 and 4-year-olds their own shadows by standing in front of a bright light source, like a lamp, and looking at the shadow that is formed on the wall or the ground.