Google has made a number of algorithm updates in the last few years and they all have nice, cute animal names. Panda, Penguin – it’s a little tough to keep track. Here’s a quick Google SEO Panda and Penguin update summary:
What is the basic difference between Google’s Panda and Penguin updates?
The Panda updates focus on poor quality sites with poor quality content. They often contain spun articles, which were the result of outdated SEO practices. Any association with thin, poorly written, and unoriginal content caused websites to slide down to the bottom of the Google results pages. Sites containing large amounts of advertising were also hurt by this update.
The Penguin updates target sites that violate Google’s Websmaster Guidelines. It’s known for targeting overly-agressive and spammy linking tactics. Companies with an unnaturally high percentage of links with a target keyword used for anchor text lost rankings. High numbers of links from poor quality sites also hurt a site’s rankings. Sites that were practicing more advanced, black-hat techniquies such as cloaking were also hit by this update.
Visit Moz.com’s Google Algorithm Change History for a full list of all changes Google has made to their algorithm.