What is Google PandaGoogle Panda is a search engine ranking algorithm. It was first released in February 2011 with the name of Farmer Update. The main aim of the Google Panda update is to lower the ranks of the sites with low quality content so that the sites with original and good quality content can be made visible on the top of the search results. Google Panda lowers down the rank of the websites having large amount of advertisements, copied contents from other sites, useless information and nonsense structure. Google Panda update is done by google time to time to improve it's search algorithm.
What is Google PenguinGoogle Penguin was first appeared in April 2012. This update aims at decrease in search engine rankings of the websites which do not follow the Google's Webmaster Guidelines. This update affects the search engine rankings of the websites which use black hat SEO methods such as purchasing fake backlinks, keyword stuffing etc to increase their rankings. The main target of Google Penguin is Spamdexing and Link bombing. It is also known as Over Optimization Penalty.
Now it seems that the Content is the most important thing to get high rankings in google. But still there are some ways to recover from Google Panda and Google Penguin penalties. I'll publish some ways to recover from Google Panda and Google Penguin in my next posts. Till then, I recommend you to read these articles: