It Increases And Decreases The Exposure (i.e. The Brightness Of The Image)
A longer shutter speed indicates more light hitting your camera sensor, resulting in a light, clear, and bright image altogether. Hence, if you shoot a picture of a tree at 1/800s or 1/1000s and then lower it to 1-second, you’ll notice the second photo (with a slower shutter speed) to be significantly and visibly brighter.
So if you are outdoors, you need to adjust the shutter speed setting to get a nice and even exposure. The specifics vary from scene to scene, but you must ensure not to under or overexpose the picture so heavily that you lose details in the darkest/lightest parts of an image.
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