If you really want to test the effectiveness of the hood, this test takes all of about 30 seconds to do. Setup your camera on a tripod and remove the hood from the lens. Take a photo. Replace the hood on the lens, and without changing any settings, take another photo. Compare the 2 at home on the computer, not on the LCD screen on the back of the camera.
If you are shooting into the sun, that is when the hood is most effective. Like others said, it is to reduce glare.
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