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Google is constantly changing its search algorithm every year and the number of changes that can be expected is in the region of 500 to 600 times. While most changes are minor, Google occasionally implements a major algorithmic update such as Google Panda and Google Penguin that can affect search results dramatically.
Search marketers will find it helpful to understand the dates of Google’s updates because it can help explain changes in rankings and organic web traffic and also to improve search engine optimization. Understanding whether your website has been penalized for any reason is a matter which would be considered seriously and the Penguin tool can certainly help you achieve this objective.