Canon 550D - Manual (Page 59)

59
3
Creative Shooting
In the Basic Zone modes, to prevent spoiled shots,
most functions are set automatically and cannot be
changed. In the (Program AE) mode, you can set
various functions and be more creative.
In the (Program AE) mode, the camera sets the
shutter speed and aperture automatically to obtain a
standard exposure.
The difference between the Basic Zone modes and is
explained on page 210.
* stands for Program.
* AE stands for Auto Exposure.