Bokeh (bo-kay) is an adaptation from a a Japanese word meaning blur. In photography this term is used to describe the quality of the areas in the picture which are not in focus. A good write up on bokeh can be found here.
This post is just a quick study of how bokeh looks in different compositions. Look for the amount of “blur” each image has and how the blur changes the farther you get from the focal point (subject).
Canon EF 50mm f/1.8 II Camera Lens
Among 35mm SLR cameras, the 50mm lens provides the closest representation to our normal perspective. This lens is usually considered the standard lens because it is reasonably fast and sees pretty much what the eye sees and is strongly recommended for most general-purpose photography.