If you eat search, you’re at least thinking about Panda. In a nutshell, Panda is:

The Panda update was designed to improve the user experience by catching and demoting low-quality sites that did not provide useful original content or otherwise add much value. At the same time, it provided better rankings for high-quality sites—sites with original content and information such as research, in-depth reports, thoughtful analysis and so on.

Google believes that helpful pages have high quality, authoritative, and comprehensive information about a users search. They hire people to answer questions about websites and from these answers they are able to recognize patterns about websites that are low-quality. One of the questions that their quality raters are asked is whether they find a particular site authoritative on a subject.

So ask yourself, “Is your site authoritative?”
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