Each year, Google changes its search algorithm around 500–600 times. While most of these changes are minor, Google occasionally rolls out a "major" algorithmic update (such as Google Panda and Google Penguin) that affects search results in significant ways.
For search marketers, knowing the dates of these Google updates can help explain changes in rankings and organic website traffic and ultimately improve search engine optimization.
For those who deal with SEO and blogging, Google panda and Google penguin should not be something new to them. Ever since these updates were introduced, there has been strong buzz on how to develop the perfect search engine optimization plan, so that websites see the benefits in their ranking.