A good answer might be:
Poems, math formulae, columns of numbers,
example program output.
But sometimes it is better to use HTML tables
for some of these.
See this topic in a later section.
Practice with Pre
Here is a web page with a program that should
It is often nice to indent preformatted text.
Indented, preformatted, text
Is useful for this.
Use it with the above program to see its effect.