Duplicate Content refers to identical or very similar text appearing on multiple web pages, either within the same website or across different websites. This can happen unintentionally (e.g., due to technical issues) or deliberately (e.g., through content copying). Search engines like Google generally dislike duplicate content because it can harm the user experience and dilute search results.
Internal Duplicate Content: The same content is accessible via multiple URLs on the same website. Example: A page is available with and without "www" or with different URL parameters.
External Duplicate Content: The same content appears on multiple websites. Example: A text is copied from another site, or several websites use the same manufacturer-provided product descriptions.
Avoiding duplicate content is essential to maximize a website's visibility and performance.