Google Panda updates are to check Duplicate content in website.

Google Panda is a series of on-going algorithm updates and data refreshes for the Google search engine that the company rolls out to help refine its search algorithm to improve the value of search query results for users.

Google Panda is a major change to Google's search results ranking algorithm that was first released in February 2011. The change aimed to lower the rank of "low-quality sites" or "thin sites", in particular "content farms", and return higher-quality sites near the top of the search results.

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