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A flash technique where you fire the flash several times to increase the exposure allowing a smaller aperture to be selected. It can also be used for special effects; the most common being strobe like effect, following the swing of a golfer or the flapping wings of a nocturnal bird. It can also be used to light the same subject in several positions in the frame - to allow a multiple exposure effect.
A flash accessory, also known as a slave cell thats used to fire another flash remotely so that multiple flash set ups can be arranged without cables and all synchronised with the cameras shutter.