Aperture is one of the most basic camera settings in photography.
Aperture refers to the opening of a lens' diaphragm through which light passes. It controls the amount of light, the depth of field and the sharpness of a picture.
It is calibrated as an f-number, such as f/1.4, f/2, f/2.8, f/4, f/5.6, f/8, f/11, f/16, f/22 or f/32.
The bigger the aperture (smaller the number), the more light comes. While higher f/stops give less exposure as they represent smaller apertures.