groff: Macro Package Intro
1.4 Macro Packages
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Since 'groff' provides such low-level facilities, it can be quite
difficult to use by itself. However, 'groff' provides a "macro"
facility to specify how certain routine operations (e.g. starting
paragraphs, printing headers and footers, etc.) should be done. These
macros can be collected together into a "macro package". There are a
number of macro packages available; the most common (and the ones
described in this manual) are 'man', 'mdoc', 'me', 'ms', and 'mm'.