Google Panda is a hot issue being discussed among the instigators of SEO lately. In a way, Google's Panda is one of the most important topics in recent years that should be known by the perpetrators of SEO, the bloggers, as well as other online marketers.
In February 2011, Google change their algorithms to determine ranking in the SERP. The main purpose of this update is to "combat" a web sites with not qualified content, especially websites with duplicate content. That way, only relevant sites are expected to appear on the first page of Google, so give the "user experience" better for Google users. This algorithm is called with Google Panda.