What is what does opaque mean?

Opaque refers to a substance or material that does not allow light to pass through it, making it difficult or impossible to see through. It can be used to describe anything that is not transparent, translucent, or clear, such as a wall, a fabric, or a container. Opaque materials can also be used to describe figurative concepts such as thoughts, motives, or actions that are unclear or difficult to understand. Opaque can be an adjective, a noun, or a verb, depending on the context in which it is used.