In photography, “bokeh” is referred to as the areas of an image that may not be in focus, therefore producing an aesthetic quality that is much different than an image in full focus. It could be called “the way the lens renders out-of-focus points of light”.
The word “bokeh” comes from the Japanese “boke” which means “blur” or “haze”. Photographers often purposely use this technique to render parts of an image that that lie outside the depth of field, a term used to describe how much focal range is introduced when taking a picture.
Apple often uses the word “bokeh” to describe the capabilities of their iPhone cameras, which can be seen when using the iPhone 7 or higher’s “portrait mode.”