What is Google Penguin?
Google Penguin is a codename for a Google algorithm update that was first announced on April 24, 2012.
Google launched the Penguin Update in April 2012 to better identify and regulate websites that were considered spammy or overly-optimized.
The Penguin targeted sites that manifested keyword stuffing as well as those that practiced black-hat SEO. On the other hand, this algorithm rewarded the sites that used white-hat SEO and that were of high quality in a generic sense.