Depth of Filed is a term used in photography. It is the range of distance that is in focus in a photograph.
In a photograph, the depth of field is determined by the aperture number and the distance setting. Within the set distance range, an area of depth in front of and behind the set point of focus is shown in sharp focus. This area is called the depth of field or depth of field. Outside the depth of field range, the image is blurred.
The depth of field can be changed by setting the aperture. At a large aperture number of f1.4 or f2.0, the depth of field range is much smaller than at a small aperture number of f11, f16 or f22. At a large depth of field, which is often used for landscape and group shots, virtually everything is in focus.