Materials through which light can pass are called transparent materials.

Here's a breakdown:

* Transparent: Light passes through these materials easily, allowing us to see clearly through them. Examples include glass, water, and air.

* Translucent: Light can pass through these materials, but it is scattered, making it difficult to see clearly through them. Examples include frosted glass, thin paper, and some types of plastic.

* Opaque: Light cannot pass through these materials at all. They absorb or reflect all light. Examples include wood, metal, and thick cardboard.