Feb 24th 2011 was a day webmasters can never forget in their lifetime. It was the day Google updated its algorithm to penalize link and content farm websites. Google decided that it was high time for the webmasters to improve the user experience of their websites and thus unleashed this Panda update targeting low quality websites that overruled the internet. Right from the first Panda update through to its recent Panda 3.2 algorithm, Google is still in the process of filtering the websites as per its quality guidelines and this makes internet a better place with reliable information.
Here is an infographic of the Google Panda update given by searchengineland. This gives a detailed analysis of how panda works, how to recover, winners and losers and much more.