Bokeh is not an Indonesian girl’s name – although it seemingly could be – but a photographic term referring to the appearance of “fuzzy” out-of-focus areas in an image produced by a camera lens.
It is especially important for large-aperture lenses (i.e. low F numbers) and long telephoto lenses because they are typically used with a shallow depth of field.
In practical terms, bokeh is an effective way to make your subject stand out. As perfectly demonstrated by the delectable Najwa: