Previously, many marketers used to manipulate google ranking by using black hat practices and used to hamper the rankings of genuine results. In order to overcome this issue, Google started framing algorithms to avoid this kind of black hat techniques. There are various kinds of algorithms but here in this block we will talk of few major affecting algorithms.
Panda update: Introduced in 2011, panda update is specially designed for sites with poor quality content such as thin content or duplicate content. Panda is updated from time to time and also may hit newly developed sites with poor content. Sometimes during an update, Sites which are previously hit may also be removed from list if the content is rectified and created according to google standards.
Penguin Update: Introduced in April 2012, Penguin update specifically targets on 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. Sites which have taken actions to remove links using the Google disavow tool may not be affected and have chances to remove from hit effect of Penguin.
Hummingbird Update: Launched in September 2013, it is named because it relies on safe and fast. This algorithm specially targets on websites speed and content reliability. Google Hummingbird is designed to apply the meaning technology to billions of pages from across the web, in addition to Knowledge Graph facts, which may bring back better results.
There are many more updates from google in order to improve the search result. Many of the algorithms are not declared by Google to avoid spam activities and maintain the search standard.
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