To surround a section of code with comment
delimiters or to prefix every line in the section with a comment
marker; this prevents it from being compiled or interpreted. Often
done when the code is redundant or obsolete, but is being left in
the source to make the intent of the active code clearer; also when
the code in that section is broken and you want to bypass it in
order to debug some other part of the code. Compare condition out, usually the preferr
that make it possible.
