Resolve duplicate content issues by defining the master version of your URLs.
Place this tag within the <head> section of your HTML document.
A canonical tag (rel="canonical") is an HTML element that helps webmasters prevent duplicate content issues by specifying the "canonical" or "preferred" version of a web page.
Using these tags consolidates link equity (ranking power) to a single URL and prevents search engines from penalizing your site for duplicate versions of the same page.