DEPTH OF FIELD

The depth of field is the distance around the focal plane which is very focused. Or when you see a picture such as the one below where one subject is focused, but the aren't as focused. Two things that affect the depth of field are the aperture and the focusing distance. When you have less aperture you can see farther or in other words it won't be so blurry. The focusing distance is using your zoom on some cameras or on other just adjusting the lenses.