Hello to Friends,
Both Google Panda and Penguin are algorithm updates. Google Panda was released February 23, 2011 and its primary goal is to evaluate websites and blogs according to design and user's experience, quality of content and usage metrics. If your website is liked by Panda, it receives an upgrade while a website that failed to meet the guidelines, Panda downgrades it.
Google Penguin protects the search engine from any black hat techniques in SEO that is released in April 24, 2012. Once it detects that you're performing techniques such as keyword stuffing, link farming, cloaking, content duplication, etc, your website is penalized or decreases its search engine ranking.
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Richard SmithPersonal Reputation Management