This is the condition in which two or more pages contain the same or similar material on the same website or among different domains. That creates confusion in the search engines about which version it should index. Thus, it shows a lot of damage regarding both SEO performance and search visibility. Duplicate content is almost always unintentional; for instance, it may include exhaustive product descriptions repeated through the pages of e-commerce sites, or it may be through different pages offered in a printer-friendly version. But while it does, it may still have its impact on rankings. Search engines are fond of original and unique contents that add value to users. Dealing with duplicate content, the website owner can use canonical tags, 301 redirects, or URL parameter modification. Regular auditing of your content will allow you to find and fix possible duplication, while ensuring that preferred versions of each page are indexed by search engines. However, quality- and originality-based content is the best way forward in robust SEO.