Projection is like when you shine a flashlight on a wall in a dark room. The flashlight makes a bright circle of light on the wall. Even though the flashlight is small, its light can make a big circle on the wall. That circle is like a projection of the flashlight’s light.
Another way to think about projection is when you draw a picture on a piece of paper, and then you use a magnifying glass to make the picture look bigger on the wall. The picture on the wall is the projection of the little drawing. It’s the same picture, just bigger and easier to see.
Imagine you have a shadow puppet. You use your hands to make a shape in front of a light. The shape that appears on the wall is a projection of your hand. Your hand is making the shape, but the shadow on the wall is what everyone else sees. It’s like showing something in a different way so it can be seen by more people.