Most digital slr cameras come with a built in flash which if used effectively can help reduce unwanted shadows in daylight or light up a backlit subject. Most photographers will use their built in flash on automatic when the sun goes down or inside a building. Direct flash often produces harsh unflattering light and as flash is subject to the inverse square law, light drops quickly to leave dark backgrounds.
One of the major advantages of digital slr cameras over digital compacts is the sheer number of accessories that can be used to enhance digital photography. One of the major accessories is the flashgun which fits into the hotshoe of a digital slr or can be connected via a sync lead if the camera has a flash sync socket or hotshoe adapter. Flashguns vary in size, power & complexity.
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