What Is Bokeh?
Bokeh is the quality of the out-of-focus areas of an image.
In digital photography, the shape of the camera lens creates the white circles in the background.

The photographer, using a digital camera, had some fun combining bubbles with bokeh.koocbor / Flickr
Once you recognize it, you’ll start seeing the bokeh effect everywhere.
One example of bokeh photography is in portraits, where all but the subject is blurred out.
On a smartphone, depth of field and bokeh work differently.
The elements needed are processing power and the right software.
Some smartphones also have a dual-lens front-facing camera for artful selfies.
Options include AfterFocus, Bokeh Lens, and DOF Simulator.
Take some practice shots to perfect your technique, and you’ll be an expert in no time.