Duplicate content is duplicate information on the Internet, for example, a piece of copied text. For your website higher in Google to get you must ensure that you avoid this. Google rewards namely qualitative and unique content. The Google Panda and Google Penguin updates of last year, this has become even more important. In concert with duplicate content in the titles (title tags) on your website:
Why duplicate content is bad?
Google removes duplicate content or duplicate information from the search results simply because it is not valuable to a user. If you’re looking for somewhere on Google and the first results are all contain the same text touch you as a user of Google and of course that should not be irritated.