What does this mean?
It sometimes happens that you want the same page in two different places on your website.
Imagine that you have a product that you offer to your business customers and also to your private customers. Then you might want to put this page into two different locations/URLs on your website.
- www.example.com/business/myproduct.html (Page Title: "My Product")
- www.example.com/private/myproduct.html (Page Title: "My Product")
Both pages have a right to exist, but Google will not know which one is the more powerful one (the original), so it will more or less split the link juice (ranking power) for the two pages.
What to do?
In this case you should use the rel="canonical" tag. The rel="canonical" tag should be put into the duplicate page and should point to the original page.
If the original from our examples above should be the page in the business folder, then the rel="canonical" tag needs to be found in the page in the private folder (the duplicate page) and should look like this:
<link rel="canonical" href="www.example.com/business/myproduct.html" />