Depth of field (DOF) is the distance between the nearest and furthest parts of a scene or subject that appear acceptably sharp in an image. A shallow depth of field isolates the subject by blurring the background and foreground, commonly used in portraits to create artistic emphasis. A deep depth of field keeps most of the scene in focus, which is ideal for landscapes, architectural, and group photography. Depth of field is influenced by aperture, focal length, distance to the subject, and sensor size, making it a critical concept for photographers aiming to control focus, composition, and visual impact in their images.