Google has been changing its ranking algorithms since December 2000. That’s when it released its toolbar extension. At the time, the toolbar update represented a sea change that would create the SEO industry as we know it. In fact, it was the first time PageRank was published in a meaningful or usable form.
Over the next decade-and-a-bit, Google continued to refine the quality of its search results. Over time, it begins to eliminate poor quality content and elevate the good stuff to the top of the SERPs. That’s where penalties – come in.
The Penguin update was rolled out in 2012. It hit more than 1 in 10 search results overnight, wiped some sites out of search entirely, pushed poor quality content off the map and forced optimizers to think much more carefully about their content strategy. Since then, SEO professionals have been very tuned in to Google’s plans, fearing the next update in case it results in a penalty for a site they’re working on.
Source : https://blog.kissmetrics.com/penalized-by-google/
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