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.
Panda updates(26 )
unnamed(1)
Penguin updates(5)
Humming bird (1)
Cassandra - April 2003(targeted multiple links)
Florida - November 2003(steaming the words)
Jagger - October 2005(duplicate content issues)
May Day - May 2010( looking for higher quality sites)
Panda - February 24, 2011(quality for content major role)
Panda 2.0 (#2) — April 11, 2011 Panda update to all English queries worldwide
Panda - Google launched Google+ — June 28, 2011
Panda - Ads Above The Fold — January 19, 2012
Penguin - "Payday Loan" Update — June 11, 2013
Penguin - In-depth Articles — August 6, 2013
Hummingbird - The name of Google’s new search algorithm
Penguin #5(aka Penguin 2.1), October 4th, 2013( this update is going to affect 1% of search queries
Total number of SEO updates from December 2000 to October 4th, 2013 are
Updates with various names(38)Panda updates(26 )
unnamed(1)
Penguin updates(5)
Humming bird (1)
Major updates from December 2000 to October 4th, 2013 are
Google Toolbar - December 2000(toolbar introduced)Cassandra - April 2003(targeted multiple links)
Florida - November 2003(steaming the words)
Jagger - October 2005(duplicate content issues)
May Day - May 2010( looking for higher quality sites)
Panda - February 24, 2011(quality for content major role)
Panda 2.0 (#2) — April 11, 2011 Panda update to all English queries worldwide
Panda - Google launched Google+ — June 28, 2011
Panda - Ads Above The Fold — January 19, 2012
Penguin - "Payday Loan" Update — June 11, 2013
Penguin - In-depth Articles — August 6, 2013
Hummingbird - The name of Google’s new search algorithm
Penguin #5(aka Penguin 2.1), October 4th, 2013( this update is going to affect 1% of search queries
