Aperture is referred to the lens diaphragm opening inside a photographic lens. The size of the diaphragm opening in a camera lens REGULATES amount of light passes through onto the film inside the camera the moment when the shutter curtain in camera opens during an exposure process.An aperture is a hole or an opening through which light travels. More specifically, the aperture and focal length of an optical system determine the cone angle of a bundle of rays that come to a focus in the image plane. An optical system typically has many openings or structures that limit the ray bundles.A camera's aperture setting controls the area over which light can pass through your camera lens.
Found this on the internet.
Photos from the lake district-
Best Photo:
Worst Photo:
These are the photo's I chose,I chose these images as the worst one is blurred and the best one is in focuse as it's blurred in the back and then you can see the berry's standing out.