What is Google Panda in reality
a “document classifier” ?

It seems that the true nature of Google’s Panda Technology is slowly showing it's self with the latest markup standards "schema.org" release. The primary function of a document classifier is performing a task that solves a problem. In the February 2011 Wired Magazine interview, Matt Cutts said: “…we actually came up with a classifier to say, okay, IRS or Wikipedia or New York Times is over on this side, and the low-quality sites are over on this side.”

The problem we have today is that low-quality content sites (derisively referred to as content farms) were ranked higher than higher-quality sites that seemed to be more important to users.

According to the Google Blog post that Amit Singhal and Matt Cutts published on February 24, “This update is designed to reduce rankings for low-quality sites which are low-value add for users, copy content from other websites or sites that are just not very useful. At the same time, it will provide better rankings for high-quality sites—sites with original content and information such as research, in-depth reports, thoughtful analysis and so on.”

This appears to be the first time Google associates “low-quality sites” with “shallow or poorly written content, content that’s copied from other websites, or information that are just not that useful”. Also, Google noted that “low quality content part of a site can impact a site’s ranking as a whole”.