The Info file format is an easily-parsable representation for online
documents. It can be read by
emacs(1)
and
info(1)
among other programs.
Info files are usually created from
texinfo(5)
sources by
makeinfo(1),
but can be created from scratch if so desired.
For a full description of the Texinfo language and associated tools,
please see the Texinfo manual (written in Texinfo itself). Most likely,
running this command from your shell: