What Is Google Panda Update?
Google panda update is a search filter which was introduced in February 2011. Purpose of this filter was to screen out the websites with low quality content from working their way into Google’s top search results. It is updated from time to time. When it happens, sites previously hit may get away, if they have made right changes. Panda may catch sites that escapes before. A refresh likewise signifies "false positives" may get released.
What Is Google Penguin Update?
Google penguin was launched in April 2012 to better catch the sites esteemed to spam its search results, particularly those doing this by buying links or getting them through link networks system designed to boost google ranking. When another update of penguin is released, sites that have taken the step to expel bad links (such as through the Google disavow links tool or to remove spam may regain rankings). Sites that are not caught before might trapped by penguin. "False positives," sites that were gotten unintentionally, may escape.