Flash
A flash of artificial light that can either provide all of the illumination for a picture or just a portion of it. The majority of cameras are equipped with their own flash units, while others have a hotshoe that allows for the attachment of a separate flash unit or the use of an off-camera flash. Large, standalone flash units or strobes are typically used in studio work. These strobes are powered by mains power and are triggered by a flash sync connection or a radio signal. Flash durations typically range from 1/200 of a second to 1/4,000,000 of a second, and their color temperatures typically fall somewhere between 5,500 and 6,000 Kelvin.
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