Google always tries to provide most relevant results to users as the demand of online marketing keeps increasing day by day. With this increased competition, spamming is also increasing. So to avoid spam, Google is constantly trying to alter its algorithms. We know very well every user is searching for the content in some form or another. It may be video, PPT, PDF, Article, Blog or website content so it is important to share unique content with users.
A few years ago when the contents would be a little less technically unique, it was easy to rank but after the numerous updates made by Google, it has become difficult to rank content. Now Google's Panda algorithm has been designed to check how well the content serves the purpose of the user. So the optimization of content becomes the most important factor to rank a website well in the SERPs(Search Engine Result Pages).