Canonical Tag

A canonical tag is an HTML element added to a webpage that tells search engines which version of a URL is the preferred or original version. It is written as rel="canonical" in the page head section. Canonical tags are used to prevent duplicate content issues that occur when the same or very similar content is accessible through multiple URLs. For example, if a product page can be reached through several different filter combinations, the canonical tag points all versions back to the main product URL. Without canonical tags, search engines may split ranking authority across duplicate pages, weakening your overall SEO performance.