When was the first Google Panda update?

In 2011, Google launched Google Panda. The software though is not like its fluffy counterpart. Google Panda was targeted at helping them sift through all the bad links and other sites which were deemed to be of a low quality. The aim was to introduce high quality websites to show up higher on the search results in order to make sure that proper legitimate businesses were getting their due instead of getting the traffic held up by unreliable, spamming websites.