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What is the Google panda factor?

With Google Panda Update 2.2 upon us, it's worth revisiting what exactly Panda is and isn't. Panda is a new ranking factor. Panda is not an entirely new overall ranking algorithm that's employed by Google. The difference is important for anyone hit by Panda and hoping to recover from it.

Google's Ranking Algorithm & Updates
Let's start with search engine optimization 101. After search engines collect pages from across the web, they need to sort through them in demand to searches that are done. Which are the best? To decide this, they employ a ranking algorithm. It's like a recipe for cooking up the best results.

Like any recipe, the ranking algorithm contains many ingredients. Search engines look at words that appear on pages, how people are linking to pages, try to calculate the reputation of websites and more. Our Periodic Table Of SEO Ranking Factors explains more about this.

Google is constantly tweaking its ranking algorithm, making little changes that might not be noticed by many people. If the algorithm were a real recipe, this might be like adding in a pinch more salt, a bit more sugar or a teaspoon of some new flavoring. The algorithm is mostly the same, despite the little changes.

From time-to-time, Google does a massive overhaul of its ranking algorithm. These have been known as "updates" over the years. "Florida" was a famous one from 2003; the Vince Update hit in 2009; the Mayday Update happened last year.

Google Panda is a change to Google's search results ranking algorithm that was first released in February 2011. The change aimed to lower the rank of "low-quality sites" or "thin sites", and return higher-quality sites near the top of the search results.