Google has a long history of famous algorithm updates, search index changes and refreshes.  Below are links to some of the most important resources for search marketers:

  • Panda Update
  • Penguin Update
  • Hummingbird Update
  • Mobile Friendly Update
  • Pigeon Update

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. Below, we’ve listed the major algorithmic changes that have had the biggest impact on search.

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