Technical
Canonical Tag
A snippet of code that tells search engines which version of a page is the main one when similar pages exist.
A canonical tag is a small piece of HTML that tells search engines, "This is the master version of this page." It is used when you have several pages with very similar or identical content, so Google knows which one to show in results and which to treat as a copy.
This matters because duplicate or near-duplicate pages can split your ranking signals or cause the wrong page to appear. Common cases include product pages reachable through multiple filters, or the same article available at slightly different addresses. Setting a canonical points all that value to the page you actually want to rank.
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