Still Life / Depth of Field.

Here is an example of a shallow depth of field, the shells in the front are focused, while the ones in the back aren't. F 5.6. ISO 400. The depth of field was caused by the short distance to subject and the aperture.

 This is another example of a depth of field, but in this case, most of the objects are in focus. F 22.0. ISO 1600.

This an example of a medium depth of field because the glass in the front and part of the bottle in the back are blurred. F 7.1. ISO 1600. This was caused by the camera being close to the objects and the aperture.