Aperture in the camera works by letting a certain amount of light into the camera to change the effect of the photo. In the first photo the lower aperture number lets less light in so the background is blurred out. In the second photo the aperture is letting more light in so the background is much more clear. Aperture is part of the exposure triangle. Changing the aperture affects the shutter speed and ISO. When you change the aperture number you also need to change the ISO and/or shutter speed to make the light meter balanced. The light meter needs to be in balance in order to produce a good quality photo.
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