Bokeh refers to the softening effect on the background obtained through a shallow depth-of-field (lower f/stop number). It’s also used to create those beautiful little confetti-like circles of light.
My Great Blue Heron, Big Blue, patiently waited for me to fire off several shots. I stood close to the foliage in front of me, throwing it out of focus too, thereby softening the foreground as well as the background. It created a frame that beautifully set off this magnificent bird.
Phone cameras are now de-focusing backgrounds shot in Portrait Mode. Don’t limit yourself to faces; try it anytime you want to blur your background!