With some cameras auto mode lets you override flash or change it to red eye reduction. your camera any extra information about the type of shot you’re taking so it will be ‘guessing’ as to what you want.
When you switch to Portrait Mode your camera will select a large aperture. This helps keep your background out of focus
Macro mode lets you get close to your object for a close up picture. This is great for taking shots of flowers, incest, and more small objects
Landscape mode is the opposite of portrait mode as it will give you a small aperture. It also allows for a large depth of field
Sports mode is also known as action mode because it captures moving objects. The way it work is it increased the shutter speed which freezes the action
Night mode is a technique also called ‘slow shutter sync’. It is used for low light situations
Movie mode extends your digital camera from just capturing still images to capturing moving ones. extends your digital camera from just capturing still images to capturing moving ones.
Aperture Priority Mode:
In this mode you are allowed to choose the aperture and the other setting are automatically set. I is useful for controlling the depth of field
Shutter Priority Mode:
Similar to aperture mode where you chose the shutter speed but the other settings are automatically set. It is useful to try and capture moving objects
Program mode is similar to Auto but gives you a little more control over some other features including flash, white balance, ISO etc. Some digital cameras have this priority mode in addition to auto mode
In manual mode you control everything, ISO, SS, AP, etc. Therefore it allows you to take pictures how you want to.