Olympus Camedia C-2100 Ultra Zoom Digital Camera "meaning planed sides" Questions

what are macro's what do they do...and what does what are macro's- what do they do...and what does the small slide switch do at the side of the camera...when in down position it shows a mountain and ...

C-2100UZ and low light I have a new C-2100UZ and very happy with it. However, I am looking for something to take night shots from the cockpit of my plane. Which means very low light and I have to use ...