Idiom of the Day
stop over (somewhere)
to stay at a place overnight or for a short time while on a trip
The airplane had to stop over in Alaska because one of the passengers had a heart attack.
Auto mode tells your camera to make its best judgement to select shutter speed, aperture, white balance, ISO, focus and flash to take the best shot that it can. Most of time you will get nice results, however if you are experienced photographer, you can experiment with manual settings to get the best results.