What is this term ‘bokeh?’  What does the bokeh filter do, exactly?  According to the product’s website:

One of the fastest growing fads in modern photography is bokeh shapes. Bokeh shapes are shapes of light in the blurred background of photos. These shapes are achieved by using a bokeh filter over the camera lens. Bokeh is a photography term derived from the Japanese word for blurred. Bokeh refers to the unfocused background in a photo.  The Bokeh Filter is a simple filter that clips onto the end of your lens. This filter blocks out pieces of light that cause the bokeh (blur) in your images to take the shape of the filter.  The Bokeh Filter has a clip-on design that allows you to quickly apply the filter to your photos.

Cool, huh?  Check out additional images below of the bokeh filter in use.

[Via Gizmodo; TheBokehFilter]