When it comes to Search Engine Optimization, or SEO, there are some definite mistakes to avoid. One of the most common mistakes website owners make is to publish whats called duplicate content.
Google defines duplicate content as, Duplicate content generally refers to substantive blocks of content within or across domains that either completely match other content or are appreciably similar. Most of the time when we see this, it's unintentional or at least not malicious in origin: forums that generate both regular and stripped-down mobile-targeted pages, store items shown (and -- worse yet -- linked) via multiple distinct URLs, and so on.