In photography, bokeh is the blur, or the aesthetic quality of the blur, in out-of-focus areas of an image. Bokeh has been defined as the 'way the lens renders out-of-focus points of light.' 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.
How to Take Beautiful Bokeh Christmas Images.