If you have pages with multiple versions, search engines may penalize all of them for duplicate content. With SEO Suite Ultimate, Magento can prevent that from happening by adding canonical
tags to main page versions.
This is particularly useful for:
Configurable products
Grouped products
Bundled products
Cross-domain content
(great for store views with different domains)
And many other page types
You can also define exceptions with a different or completely omitted canonical tag manually.