Aperture Settings

F2.8

F16

1. The part of the body that we can most relate aperture to is your eye. Well, more specifically the  pupil of your eye. 
2. The smaller the Aperture means that less light is able to get through, so the lens is more focused on everything. The higher the Aperture means that the lens is bigger and more light can get through, and so the picture is focused just on one subject. 
3. Aperture affects Depth of Field because it makes the image look sharper.