Panda & Penguin from Google have drastically affected every one of us in online marketing. In order to avoid Google Penalty you must take the business of online promotion, seriously.
While Panda focuses on the relevancy of the content of the website & its unique nature, Penguin was aims at pushing down the websites violating Google's Webmaster Guidelines. It became a nightmare for sites engaged in black hat SEO, keyword stuffing, engaging in link schemes and cloaking. Analysts say that Penguin affected more than 3.1% of search queries in English and 3% of queries in international languages like German, Chinese, & Arabic, and the percentage was even bigger in "highly-spammed" languages. Panda was more focused on the user experience and Penguin was an update to check web spam in online marketing space.