Depth of field is the near to far sharpness in your pictures. A picture with shallow depth of field has only the main subject in focus, and everything in front of it and behind it is blurred. The opposite is a picture with deep depth of field, where everything is sharp from right up close […]
Ultra close up photography where the camera is so close to the subject that it's reproduced at life size on the camera sensor. This is the definition of 'macro' photography – 1:1 reproduction.