The term bokeh comes from the Japanese word “boke” which means “blur” or “haze”. Probably pronounced "bow-keh", "Bow" sound as in bow and arrow and "keh" sound as in Kevin. Bokeh can be created by using a shallow depth of field. While bokeh is often found in the background of photographs, an abstract photo of entirely bokeh can be created by photographing a series of lights intentionally out of focus.
Bokeh is different from sharpness. Sharpness is what happens at the point of best focus. Bokeh is what happens away from the point of best focus. When you use a lens at a wide aperture (ƒ1 - ƒ5.6), 'Bokeh' refers to the out of focus portions of the image - in particular its visually pleasing nature or lack thereof.
Examples:
*** Look at the backgrounds of these 2 pictures. You can see that there are circles at the backgrounds, This is what we called BOKEH.
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