Definition: WYSIWYG is an acronym for "What You See is What You Get." When textual content is being edited in WYSIWYG format, it means that it will appear similarly, if not identically, to the content in the final document (as opposed to HTML coding).
e-Newsletters are often compiled as WYSIWYG so the author can get a sense for the true look-and-feel of the content as recipients will see it.