What is this?
Content duplication means several different urls point to the same content. It often happens by content management system (CMS, like wordpress) providing many urls for viewers to easier access the same post/page.
While content duplication is advantageous for viewers, it could hurt search engine site ranking (lower your rank on search results) since the search engine doesn’t know which url is the right one to show.
- URL redirection
- Canonical URLs