groff belongs to an older generation of document preparation
systems, which operate more like compilers than the more recent
groff and its contemporary counterpart, TeX, both
work using a batch paradigm: The input (or source) files are
normal text files with embedded formatting commands. These files can
then be processed by
groff to produce a typeset document on a
variety of devices.
groff should not be confused with a word processor, an
integrated system of editor and text formatter. Also, many word
processors follow the WYSIWYG paradigm discussed earlier.
Although WYSIWYG systems may be easier to use, they have a
number of disadvantages compared to
troffis firmly entrenched in all UNIX systems.
“GUIs normally make it simple to accomplish simple actions and impossible to accomplish complex actions.” –Doug Gwyn (22/Jun/91 in
 What You See Is What You Get