What is Bokeh?
Bokeh is a Japanese word 'boke' which means Blur. In photography when we shoot with any fast lens and create an effect of soft out of focus background in back of your subject which also looks pleasing and aesthetically beautiful.
Nikon 50mm f/1.8G AF-S NIKKOR FX Lens for Nikon Digital SLR Cameras
How to Create Bokeh?
Creating bokeh is as simple as dressing your hair, all you need to know the style you want to create. Any fast lens is okay to create bokeh. The faster the lens the better the result. You can use a lens with an aperture at least f/5.6, but talking an ideal, it's good to use 50mm, f/2.8 or faster like f/1.8, f/1.4. if you are rich enough to buy multiple fast lenses its good, but if you don't own faster lens, there's no need to worry. In fact, even your kit lens is capable enough to create beautiful aesthetic quality bokeh. While taking bokeh photograph try to increase the distance between your subject and the background and decrease the distance between your camera and the subject as much possible as your camera minimum focus distance allowed you. The more the distance between the subject and background the more out of focus it will be and you ll get better results. A simple portrait with a high depth of field is also a good example of a Bokeh. You can use this technique in various style photography.