Cinematography
Bokeh
The aesthetic quality of the blur produced in the out-of-focus parts of an image.
In Depth
Bokeh (from the Japanese word for 'blur') isn't just about a blurry background; it's about the quality of that blur. Good bokeh is creamy and smooth, often with circular highlights, achieved by using large apertures.
Example
"The Christmas lights in the background turned into soft, glowing orbs, creating beautiful bokeh behind the actor."