WYSIWYG (pronounced "wiz-ee-wig") editor or program is one that allows a developer to see what the end result will look like while the interface or document is being created. WYSIWYG is an acronym for "what you see is what you get".
WYSIWYG editor allows users to manipulate text and graphics to resemble what its appearance will look like when published.Essentially it allows anyone to edit in a Word-like fashion, which is great because that's what most professionals are familiar with anyway.