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Wiki
In photography, bokeh (play /ˈboʊkə/ boh-kə,[1] Japanese: [boke]) is the blur,[2][3] or the aesthetic quality of the blur,[4][5][6] in out-of-focus areas of an image, or "the way the lens renders out-of-focus points of light."[7] 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.[2] 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.
Bokeh is often most visible around small background highlights, such as specular reflections and light sources, which is why it is often associated with such areas.[2] However, bokeh is not limited to highlights; blur occurs in all out-of-focus regions of the image.
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