Know more about Google Panda Update
Google launched its new Panda filter update in February 2011. The purpose of this update is to prevent weak and poor-quality sites to occupy high ranks on Google search engine.
As per reports, Google launches Panda updates from time to time and allows meritorious sites to dominate the search engine.
It refreshes its strategies to catch “false positive” sites which they may have escaped before and improve their SERP.