The term "f/16" refers to a specific aperture setting on a camera lens. Aperture controls the amount of light that enters the camera, and the f-stop number indicates the size of the lens opening. A setting of f/16 means the aperture is relatively small, allowing less light to hit the camera sensor, which is useful for achieving a greater depth of field. Using f/16 is common in landscape photography, where it's important to keep both the foreground and background in focus. This setting helps create sharp images across a wide range of distances, making it ideal for capturing detailed scenes in nature or urban environments.