Depth of field
The Gaussian blur filter can be used creatively to blur distracting backgrounds. Most digital cameras achieve greater depth of field (more in focus) at the same aperture when compared to their 35 mm film cousins, due to their comparatively small sensor size. This is great in some instances but introduces unwelcome detail and distractions when the attention needs to be firmly fixed on the subject.
There is often a lot to think about during the capture of an image, and the time required to consider the appropriate aperture and shutter speed combination for the desired visual outcome often gets the elbow. Photoshop elements ...