How does Google’s Algorithm Updates affect SEO?

Panda. Penguin. They may sound cute and cuddly, but don’t be fooled. Search engines use complex algorithms to crawl and index websites and pages in order to present myriad search results to searchers in seconds. And each search engine—there are over two hundred and fifty on the Internet at present (and counting)—uses a unique algorithm to do so. [Update: 1 September 2016. Google Possum has now launched, an algorithm update that affects local search.]

Google’s market share dominance means SEO’ers need to only cosy up to one search engine to accomplish their ends. But how do Google’s algorithm updates affect your SEO?

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