We mark the dates that Google updated its algorithm so that you can can tell if big changes in your rankings fall in line with Google’s updates.
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Major Algorithm Update refers to the roll-out of one or many significant algorithm changes that often fundamentally alter the way search results are indexed and ranked. Examples of these updates include Panda and Penguin.

Panda Updates are all major and minor algorithm updates associated with Google Panda. Panda was released by Google on February 23rd, 2011.

Penguin Updates are all major and minor algorithm updates associated with Google Penguin. Penguin was released by Google on April 27th, 2012.

Google Search Quality Updates aim to down-rank or otherwise penalize domains or pages believed to be employing unfair or unintended methods to manipulate search results. These methods include questionable link practices, over-optimization, and various other types of “black hat SEO.”

Freshness Updates are regularly used by Google to keep search results relevant and up-to-date. They primarily affect search results that involve recent events or hot topics, regularly recurring events, or frequent updates.

New Feature or Enhancement Update refers to any improvements or additions to Google Search properties. These types of updates include roll-outs of and improvements to features like Google+, Local Search, improved social signals recognition, Universal Search, Knowledge Graph, and Google Instant.
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