Google Updates 1. PandaFebruary 24/2011Important Points: Duplicate Content Check, Copy or thin content, keyword stuffing 2. PenguinApril 24/2012Important Points: Spammy or irrelevant links, links with over-optimized anchor text 3. HummingbirdAugust 22/2013Important Points: Keyword stuffing, low-quality content 4. PigeonJuly 24/2014 (US), December 22/2014 (UK, Canada, Australia)Important Points: Poor on- and off-page SEO 5. MobileApril 21/2015Important Points: Lack of mobile version of the page, poor mobile usability 6. RankBrainOctober 26/2015Helping Hand of HummingbirdImportant Points: Lack of query-specific relevance,...