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+<strong>Variants</strong> are output handlers, and every page_manager_pages page should have at least one. Most pages (page manager pages) will simply have only one. Pages with multiple variants will choose one and only one Variant to display content to the user and will use the <strong>Selection Rules</strong> to figure out which Variant to display.
 
-Please visit <a href="http://drupal.org/node/528078">http://drupal.org/node/528078</a> to help provide this documentation page.
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+Variants are to do with Panels, and are a way to vary an output slightly. Variants can inherit most of their behaviour and can override what they need. If you have experience with Views then it is most closely like having another display. The variant may be changing how the panel is laid out or may add other elements. The decision to use one variant or the other can be based on selection rules or contexts, selection rules being more global and context more about what is being looked at, i.e. the node being viewed etc.
+
+Variants can make use of panels_display (layouts) and its corresponding panels_pane (content types).
+
+How variants are binded to layouts.
+
+Each record of variant has a column conf and inside conf is a foreign key did which points to a
+panels_display record primary key.
+
+Please visit <a href="http://drupal.org/node/528078">http://drupal.org/node/528078</a> to help provide more to this documentation page.