Google Supplemental Index

Index where pages with lower trust scores are stored. Pages may be placed in Google's Supplemental Index if they consist largely of duplicate content, if the URLs are excessively complex in nature, or the site which hosts them lacks significant trust.

Google's Supplemental Index, is a secondary database containing Supplemental Results pages deemed to be of less importance by Googles algorithm or are less trusted. The primary measure of a pages importance is the number and quality of links pointing to that page. Pages in the Supplemental Index can still rank in search results, but this will depend on the number of pages in the main index relevant to the search. Some reasons pages may be in the Google Supplemental Index: * Duplicate content * Low PageRank * Lack of trust * A site with a large number of pages * Page freshness * Excessively long URLs As of July 2007 Google discontinued the practice of placing a Supplemental Result tag on search results making it near impossible to tell whether a result is in the supplemental index or the main one.