aperture

Aperture is the size of the lens hole. A small number equals a large hole, and vice versa. A small number is best used for small or moving objects as closer objects will be in focus and the shutter speed can be faster as the large hole lets in a lot of light at once. A larger number is like a wide-angle lens and will get most of the picture in focus, it also needs a longer shutter speed so as not to under-expose the picture, so it is used for landscape

 the pictures of the bag are using a small F. (aperture) number, you can see the close to detail, but the background is indistict

 the shots of the room are using a large F. (aperture) number, almost the whole of the picture is in focus