Duplicate Content

Definition

Substantially identical content that appears at more than one URL, on the same site or across different sites.

Duplicate content occurs when the same or very similar text is accessible via multiple URLs, whether through technical issues like parameters and protocols or through repeated boilerplate and syndication. It forces search engines to pick a canonical version, can split ranking signals, and wastes crawl budget, though it is rarely a manual penalty in itself. It is managed with canonical tags, redirects, consistent internal linking, and by ensuring each page offers distinct, purposeful content.