This piece of information explains about common Google algorithms ie. Google Panda,Google Penguin and Hummingbird.

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What is an algorithm change?

Algorithm are basically computer programs that look for clues to give you back the result that you are exactly looking for.Every year, Google engineers modifies the search algorithm around 500–600 times. Some of these changes are minor while Google occasionally rolls out a “major” algorithmic update (such as Google Panda and Google Penguin) that affects search results in significant ways.

What is the Panda algorithm?

Panda was first launched in year 2011,February 23.Purpose of launching Panda was to show high-quality sites higher in search engine result pages(SERP) while demoting the websites that may be of lower quality.
Following are the parameters that are covered under Panda algorithm.

1) Thin Content
2) Duplicate Content
3) Low Quality Content

What is the Penguin algorithm?

The Penguin algorithm initially was rolled out year 2012 ,April 24.The goal why Penguin was launched was to identify the websites that have cheated by creating unnatural backlinks in order to gain an advantage in the Google results. While the primary focus of Penguin is on unnatural links, there are several other factors too associated that might consider a website to fall prey of Penguin

What is Hummingbird?

Google made announcement about Hummingbird algorithm on September 26, 2013.The focus of the Hummingbird algorithm is for Search Engine(Google) to . Hummingbird was a complete ravamp of the entire Google algorithm.Unlike,Panda and Penguin which are algorithm changes that were putting a new part in the engine whilst , Hummingbird wasn’t just a new part; it was a completely new engine.