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.  However, bokeh is not limited to highlights; blur occurs in all out-of-focus regions of the image.
Bokeh, also known as “Boke” is one of the most popular subjects in photography. The reason why it is so popular, is because Bokeh makes photographs visually appealing, forcing us to focus our attention on a particular area of the image. The word comes from Japanese language, which literally translates as “blur”.