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If you routinely don't get the image you want—and instead get what happened just afterward—it's because the camera has to autofocus and take an exposure measurement at the same time.
If you can push the shutter button partway, the camera can take these measurements ahead of time. Then you can the picture right when you want to.
About the photo: From September 1999, this photo by Steve McCurry is of workers in a field in Kashmir.