Duplicate Content

Duplicate content is the same, or very similar, content appearing at more than one URL — whether across your own site or copied between sites. It confuses search engines about which version to rank and can split the signals that would otherwise concentrate on one page. There is no single "duplicate content penalty", but it dilutes performance.

Most duplication is technical and internal: URL parameters, http/https, www/non-www, printer versions, and boilerplate product descriptions. Resolve it with canonical tags, consistent internal linking, and redirects, so signals consolidate onto one preferred URL. For syndicated content, use canonicals or agreements so the original gets credit. Rewrite thin, templated descriptions that duplicate manufacturer copy across ecommerce catalogues.

Senior practitioners see duplicate content as a signal-consolidation and crawl-efficiency problem, not a penalty risk, and they audit for it systematically on large sites where it multiplies through faceted navigation and templates. They decide deliberately whether to canonicalise, noindex, block, or consolidate each duplication pattern, and treat near-duplicate thin pages (common in programmatic SEO) as an indexation-quality issue that drags the whole site down if left unmanaged.