Well, refraction of light is bending the path of the light so that its direction of propagation changes, as shown below.
This picture is an example of light being refracted through a rectangular prism. Refraction occurs whenever light passes from a region or medium with one index of refraction to a region or medium with a different index of refraction. Another example is light going through water which can be demonstrated with a pencil in a beaker of water.
Also a magnifying glass refracts light because it has to bend light to different angles to be able to focus to a point.