Here's a breakdown:
* Parallel Rays: These rays lie in the same plane and never intersect. They maintain a constant distance from each other.
* Skew Rays: These rays lie in different planes and therefore never intersect. Imagine two lines on a piece of paper (one line on the surface and the other going through the paper).
Note: If we are talking about light rays, the concept of "intersection" can be slightly more nuanced. Light rays can also *appear* to intersect due to reflection or refraction. For example, a mirror can reflect light rays to make them appear to intersect at a point behind the mirror, even though the rays themselves never actually touch.
