Matt Cutts today announced on Twitter that Google has rolled out the Panda 4.0 algorithm impacting ~7.5% of queries that can be noted by the regular user while searching.

As we know that Google Panda deals with low-quality spam content and prevents sites from ranking in Google results that have low-quality content.

Matt Cutt said this is an update and not an algorithm refresh and is supposed to be softer and gentler compared to previous versions.

Google Panda 4.0 affects different languages to different degrees. This algorithm is being said a softer stand towards websites as well, as upcoming updates or changes will be based on this new algorithm calculation of Panda 4.0