Duplicate content is one of the biggest headaches for every SEO expert. Even if there are two different URLs for one page, the search engine is never definite which page to show on this or that keyword, which page to give the PageRank to, and which page to consider as the main. Eventually, it divides the authority and page rank on its own what makes the page you are trying to promote far enough in the search listings.
Identical content can seriously hurt your website page rankings, but using the Ultimate SEO Suite extension you can reduce the amount of duplication. When crawling and indexing your site, search engines adopt canonical URLs and single out the main among the duplicate pages. In other words, if there are two different URLs for one page, a canonical tag implemented by the extension tells the robots which page it should promote. This gives you more control over the URL returned in search results.