Aperture  Aperture refers to the opening in a lens through which light passes to reach the camera's sensor. It is measured in f-stops, with lower f-stop numbers indicating larger apertures and higher f-stop numbers indicating smaller apertures. 
 
Aperture plays a crucial role in photography by controlling the amount of light that enters the camera, which affects the exposure of the image. 
 
A larger aperture (smaller f-stop number) lets in more light, resulting in a brighter image and shallower depth of field, where the foreground is sharp while the background is blurred. 
 
Conversely, a smaller aperture (higher f-stop number) allows less light, resulting in a darker image and a greater depth of field, where more of the scene is in focus. 
 
Aperture also influences the quality of the out-of-focus areas in an image, known as bokeh. |