In terms of website and SEO, a canonical URL is the preferred version of a page. It is used to tell search engines which version of a page you want them to index.
There are a number of reasons why you might want to use a canonical URL. For example, you might have two pages with the same content, but with different URLs. In this case, you would want to use a canonical URL to tell Google which version of the page you want them to index.
Another reason you might want to use a canonical URL is if you have a page with a lot of duplicate content. In this case, you would want to use a canonical URL to tell Google which version of the page you want them to index and to avoid duplicate content issues.
To create a canonical URL, you can use the rel="canonical"
tag. This tag should be placed in the head section of the page that you want to be the canonical URL.