You can think of a Master Page Layout—we call it a Zen Master— as the default page layout for your entire space (or entire site. See info box at right →)
From the Zen master, you define the standard layout for all Zen pages within the site or a space. So what's in a layout?
You can opt for 3 columns, 2 columns, or no columns (resulting in one large main section.)
content within those side columns
The sky is the limit here. Some ideas: page trees, table of contents, recent updates, attachments, and page turners.
Keep in mind this content will come in automatically on every page created in the space run off this master.
optional main content sections
These sit above or below the main content. You can think of them like banners, headers, or footers for your page. See adding top and bottom sections for more information.
A Master Page Layout can be defined for the entire site, as well as for an individual space. We always recommend defining a Master Page Layout at the site level, to provide a common default layout.
How do I override the Master Page Layout for a specific page?
See the Override the Zen Master for a Specific Page section of the User Guide for detailed information.