Aperture is essentialy the blades within a lens. Aperture controls how much light is coming into the camera.
It also controls depth of field
As the camera lets less light and the blades create a smaller hole in then the depth of field is larger creating a sharper image. If the more light is let in and the hole is bigger the depth of field is smaller creating a more blurred image.
The depth of field is different as a larger depth of field and smaller lens has been used on the padlock to create a sharper image as it concentrates on it more. A larger depth of field has been used on the desert to create a sharper look on the landscape. For the landscape image you would want to use either f11 or f16.
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