In the largest update of its kind since the launch of Panda in early 2011, the newest version of Google's algorithm is said to have affected 7.5% of English language search queries. Panda 4.0 has worked its way through millions of websites, penalizing some top players like ebay.com, biography.com and retailmenot.com.
Panda targets websites with low-quality content and removes them from Google's indexes. This update has changed how search engine robots crawl and identify low-quality websites, which has created a massive fluctuation in rankings and search results.
While Google's quality standards may be vague, if you've seen a drop in rankings, an audit of your content may be one of the first places to start.