1. A popular lighting "pre-visualization" (visualizer, pre-viz) program by Cast Software. WYSIWYG (pronounced "whiz-ee-wig") is an acronym for "What You See Is What You Get". Sometimes shortened to WYG (pronounced "wig".) Product Website 2. Computers. Used to describe actual real-time functions: WYSIWYG-editing, for example displays exactly how a page will appear, without going to a preview mode to eliminate mark-up language and other appearance parameters.