Duplicate content is identical or very similar text that can be found at multiple URLs at the same time, making it difficult for search engines to determine which version to index and rank.
Internal versus External Duplication
Duplicate content It can occur internally (the same text appearing on multiple pages within a single website) or externally (the same text appearing on multiple websites). Internal duplication is the most common and often occurs unintentionally due to URL parameters, session IDs, www versus non-www versions, or HTTP versus HTTPS without proper redirects.
Google rarely penalizes sites, but ranks them poorly
Google does not impose manual penalties for most cases of duplicate content. However, it distributes the so-called link equity across the duplicates and decides on its own which version to display—often not the one the website owner would prefer. Intentional duplication to manipulate rankings may result in a penalty.
Solutions
- Canonical tags: Tell search engines which URL is preferred.
- 301 redirects: Permanently redirect all duplicate versions to the canonical URL.
- Unique content per page: the most sustainable solution.
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