According to Wikipedia, A scaffold "is a temporary structure used to support a work crew and materials to aid in the construction, maintenance, and repair of buildings, bridges, and all other man-made structures". In mobile application development, the Scaffold class implements the basic material design visual layout structure. This class provides APIs for showing drawers, snack bars, and bottom sheets. 
http://www.yzsuperscaffold.com/systems-scaffold/
		
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