Content duplication on multiple domains occurs when identical or substantially similar content appears on different websites or domains. This can happen intentionally, such as content syndication or licensing agreements, or unintentionally due to content scraping, URL canonicalization issues, or domain variations. Search engines like Google aim to provide users with diverse and relevant search results, so they may prioritize indexing and ranking of original or canonical versions of content while filtering out duplicates. Websites with duplicated content across multiple domains may face indexing issues, with only one version of the content indexed or displayed in search results. To address content duplication on multiple domains, webmasters should use canonical tags to specify the preferred URL for indexing, monitor inbound links and referral traffic to identify content scraping or syndication, and submit removal requests for unauthorized duplicates through Google's Removals tool.