Here's a breakdown:

* Refraction is the bending of a wave as it passes from one medium to another. This occurs because the wave's speed changes as it moves from one medium to another.

* Examples:

* Light refracting as it passes from air to water, causing a straw in a glass to appear bent.

* Sound waves refracting as they pass from warm air to cold air, causing sound to bend around corners.

Let me know if you'd like more details about refraction!