The Panda update – introduced in February 2011 meant to stop sites with poor quality content, a search results algorithm which filtered out websites with thin, low quality content. Google Panda stripped search results pages (SERPs) of poorly constructed, spammy content.
The Penguin update – in April 2012 to better catch sites deemed to be spamming its search results, in particular those doing so by buying links or obtaining them through link networks designed primarily to boost Google rankings
The Hummingbird update – September 26, 2013, Hummingbird lends understanding to the intent and contextual meaning of terms used in a query.
The Pigeon update – Launched on July 24, 2014, for U.S. English results, the “Pigeon Update” is a new algorithm to provide more useful, relevant, and accurate local search results that are tied more closely to traditional web search ranking signals.
The Fred update – on March 7, 2017, Google Fred is an algorithm update that targets black-hat tactics tied to aggressive monetization. This includes an overload on ads, low-value content, and little added user benefits.