Google Panda is the new update from Google to fight against low quality and duplicate content in websites. If your website has no relevant content or any copied content, then you are going to be affected by this change. The main purpose of this change from Google is to promote quality content with uniqueness.
SEO methods changed with Google Panda update:
After Google Panda, SEO methods need to be viewed from a fresh perspective. All methods of link building strategies and the direction are changed in some dimensions as a result of this update. All the efforts that go into increasing the page rank of a website are modified by Google Panda.