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Introduction
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Macros are a way to define a chunk of presentation in one template, and share
it in others. Changes to the macro are immediately reflected in all of the
places, that share it.

Such, a developer can easily write some sort of 'page-skeleton' (the macro),
which can be reused in other pages to take care, for instance, for a certain
and consistent look-and-feel of a whole site with less maintenance.

Technically, macros are made available by ``METAL``, a Macro Expansion for TAL,
which ships with nearly every Zope installation. They can be used in Zope Page
Templates. See the `TAL`_ and `METAL`_ pages for details.

.. _`TAL`: http://wiki.zope.org/ZPT/TAL
.. _`METAL`: http://wiki.zope.org/ZPT/METAL