The Basics of Duplicate Content
Duplicate content has been a much talked about topic in the world of SEO in recent years, especially since the explosion of blogs and newsfeed sites. Duplicate content is essentially any web content that appears on multiple web pages, either on the same site or on different sites. Search engines tend to frown upon duplicate content and if they come across several pages with content that is the same or too similar, they'll only include one of these pages in the search results and leave out all the rest.
Malicious and Non-Malicious Duplicate Content
Malicious duplicate content is duplicate content generated with the intent of spamming search engine results. This type of duplicate content is often bot generated or simply copied and pasted directly from the source with no original aspect to it. Non-malicious duplicate content, on the other hand, is duplicate content that is generated for a specific purpose other than site spamming. For example, multiple views of a web page, mobile versions of a site and print-friendly versions of a web page would all fall under the category of "non-malicious" duplicate content.
Duplicate Content Filters
In order to weed out duplicate content from their search results, search engines use duplicate content filters, these are programs designed to pinpoint web pages whose contents are exactly the same or too similar to each other. Because sites that rely too heavily on duplicate content often suffer in search result listings due to duplicate content filters, SEO experts strongly advice webmasters to post as much original, human-written content on their web pages as possible. Online retail sites that employ product descriptions taken directly from the product manufacturer's site also can run into trouble with duplicate content filters.
Duplicate Content Tools
Duplicate content tools are offered by some websites, SEO resellers and SEO providers. They are essentially programs that scan your site and help you determine whether your pages have content that is too similar to the content of other pages and might thus potentially be weeded out by search engines' duplicate content filters. Duplicate content tools measure the similarity between the text of different pages as well as markup similarity, especially the similarity between HTML tags.
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Comments
Actually duplicate content on the same websites is not acceptable. That is why even article directories do not accept submission of the same article twice.
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