A canonical tag tells search engines which version of a page is the real, preferred one. It prevents URL variations from being treated as separate, duplicate pages.
Why they matter#
Search engines can read different URL variations as separate pages, for example
yoursite.com/about-us and yoursite.com/About-us, even though they show the same content. The canonical tag resolves that by naming the one true URL, so all the ranking signal points to a single page.In your page's source it looks like this:
<link rel="canonical" href="https://www.yoursite.com/about-us" />.On Limecube this is fully automatic. A correct canonical tag is set on every page for you, there's no canonical setting anywhere in the SEO Manager, and nothing to configure. It quietly prevents duplicate-content issues from things like capitalisation or trailing slashes.