Causes of internal duplicate content

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However, if both domains remain valid, valuable ranking potential can be lost. Search engines place their own index decisions far behind SEO-optimized and cleanly indexed websites. The uncertainty as to whether the non-original content really fits just one query leads to this approach.

It really becomes harmful to SEO when a search engine bot considers duplicate content to be an attempt at fraud and then demotes the website in the search results .

A distinction is made between internal and external skype database duplicate content: Internal DC refers to content on a domain that can be accessed via multiple URLs. This is almost always done by adding an additional word, a category name, to the web address. A supplementary assignment, so to speak.

In web shops, the phenomenon occurs, for example, due to the different click paths to a product.
If clicked directly, the URL ends with: .de/produkt1
However, if selected via a category, the same page appears under an additional URL, such as / de/produkt1/kategorie1/produktseite1

However, duplicate content is created in many other internal ways:

Printer-friendly pages and PDF downloads generate their own URLs.
Also variations of pages of a product, links, tags
Distinguishable session IDs receive their own web addresses.
Content management systems add URL endings with /index.htm/ or similar.
Causes of external duplicate content
External duplicate content means that the same content appears on different domains. If it is your own fault, it is almost always an oversight . For example, if a company runs its projects on different domains or publishes a message on both sites.