What I came know about Google panda is that it identifies duplicate contents in the web and deletes them. The outcome at last is that all the sites which have duplicate content gets dropped from the Google rankings.
According to me, Google panda software developed by Google in advance to bring high-quality website. The main purpose of Google's giant panda is a high quality web site Google search results page in front of, and punished the low-quality content. Therefore, we should avoid duplicate content.
Google panda is one type of algorithm to prevent content from Robbers and Spammers. It finds the content which are not relevant and natural ,Just copy and paste description and remove it. So, We can say that it helps to increase web page ranking.
What I’ve heard about it is that it deletes duplicate contents on websites and keeps the original and related ones. Once the duplicates are deleted the rank of the related website drops.