Duplicate content is substantial blocks of content that are identical or very similar across multiple URLs, either within one site (internal duplication) or across different sites (external duplication).
Definition
Duplicate content is substantial blocks of content that are identical or very similar across multiple URLs, either within one site (internal duplication) or across different sites (external duplication). Search engines do not usually "penalise" duplication in the sense of a manual action, but they do have to choose one version to index and rank, which means signals get split, the wrong version can be chosen, and crawl budget is wasted on redundant URLs.
Internal duplication is common and mostly technical: the same page reachable with and without a trailing slash, with tracking parameters, via HTTP and HTTPS, through faceted filters, in a print view, or with session IDs. External duplication includes syndicated content, manufacturer descriptions reused across many sites, and content scraped from elsewhere.
In context
On iGaming affiliate sites, internal duplication usually comes from templated pages and URL parameters, and it is handled with canonical tags pointing every variant at the clean preferred URL, plus noindex on filter combinations that should not be indexed at all, plus consistent internal linking and sitemaps that only reference canonical URLs. External duplication is a bigger risk here because operator-supplied bonus terms, game descriptions and "about" text are often pasted verbatim across dozens of affiliate sites, so a page built mostly from that shared text has almost nothing unique for a search engine to reward.
The durable answer to external duplication is original material: the affiliate's own testing notes, its own screenshots, its own rating and reasoning, its own comparison data. A review that wraps a paragraph of original assessment around the operator's boilerplate is fine; one that is 90% operator boilerplate is effectively duplicate content and will struggle regardless of how many such pages the site publishes.
Auditing for duplication means checking both the technical parameter sprawl and the proportion of each page that is genuinely the site's own.
Worked example
An affiliate's review pages score poorly and an audit shows each is 85% operator-supplied boilerplate (bonus terms, "about the casino" text) shared with 30 other affiliate sites. The team rewrites 200 reviews around original payout testing, screenshots and a scored assessment, keeping only short quoted excerpts of official terms, and rankings improve as the pages become genuinely distinct.
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