There are 15 major changes are occurred in Google Algorithm target on SEO.
They are,
Unnamed Update — November 14, 2013
Penguin 2.1 (#5) — October 4, 2013
Hummingbird — August 20, 2013
In-depth Articles — August 6, 2013
Unnamed Update — July 26, 2013
Knowledge Graph Expansion — July 19, 2013
Panda Recovery — July 18, 2013
Multi-Week Update — June 27, 2013
Panda Dance — June 11, 2013
"Payday Loan" Update — June 11, 2013
Penguin 2.0 (#4) — May 22, 2013
Domain Crowding — May 21, 2013...
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