In photography, bokeh  is the aesthetic quality of the blur produced in the out-of-focus parts of an image produced by a lens .Bokeh has been defined as “the way the lens renders out-of-focus points of light”. Differences in lens aberrations and aperture shape cause some lens designs to blur the image in a way that is pleasing to the eye, while others produce blurring that is unpleasant or distracting—”good” and “bad” bokeh, respectively.

Bokeh occurs for parts of the scene that lie outside the depth of field. Photographers sometimes deliberately use a shallow focus technique to create images with prominent out-of-focus regions.

They way that bokeh is created is by focusing the camera on an object in the fore ground of the image and having lights in the back ground of the image, by focusing the camera in the foreground image it creates as shallow depth of filed thus causing the lights in the background to blur creating the bokeh.