Shutter Speed. What is it?

High shutter speed.

Slow shutter speed.

1.                         2.
A- slow               A- high         
B- slow               B- slow
C- high               C- high
D- high               D- high
E- slow               E- slow
F- high               F- high

2. Auto mode basically has the shutter & aperture together just on auto. You can even switch it to manual mode to control it more manually. Or even aperture priority, when you control the lens but the shutter speed it automatic.