Google Panda was one of the most important updates that we have seen in the Google algorithm in recent years has changed the Search Engine Optimization methodology of many SEO consultants. Google Panda came to light in February 2011 and have since gone out new versions of this famous update to the point that we are now at version 24 of Google Panda and in short we find the 25, probably later this year.
This update is not really, as many people think, a Google algorithm update but is actually a filter that is applied to the same, as is the case with Google Penguin, although in the case of updating the Penguin filter is intended to techniques of artificial link building.
Google Panda was intended to penalize or lower positions of the sites:
1. They are poor in content, or what is the same, they have very little content on your website and therefore do not provide information about
2. Have duplicate content (copied from elsewhere on the web). We have seen many cases of sites being penalized even the original authors of the articles simply because others have copied the article as is and Google has failed to distinguish the original author.
3. Posen low quality content. Understood as little originality content that does not attract any interest to people and / or fill is written exclusively for keywords.