Duplicate content is the substantive block of content within or across domains that either that completely matches other content or are appreciably similar. Most of the time when it is found, it is either unintentional or at least not malicious in origin such as forums that generate both regular and stripped-down mobile-targeted pages and so on. In some cases, content is duplicated across different domains in order to manipulate search engine rankings or gather more traffic via popular or long-tail queries.

Again, Google algorithms don’t view the same article written in English and German as duplicate content. Users typically want to see a diverse cross-section of unique content when they do searches. In contrast, they’re understandably annoyed when they see substantially the same content within a set of search results.

Google tries to show distinct information while it crawls and searches information. if your site has articles in “regular” and “printer” versions and neither of the set is blocked in robots.txt or via a noindex meta tag, It will choose either of the version to its list. In certain rare cases, Google perceives that duplicate content may be shown with intent to manipulate its rankings and deceive its user, it also makes appropriate adjustments in the indexing and ranking of the sites involved. So in major cases, the worst thing that webmasters will see is the “less desired” version of a page shown in Google index.