Depth of Field

This picture is an example of depth of field. The light bulb in the front is the only thing in focus. All the other light bulbs in the background are blurred out. There is a light bulb in front of the one in focus, but it is also blurred out. You can tell this is a picture of depth of field because as you get farther into the line of light bulbs, the light bulbs blur out more than the one before.