What is Canonical URL

In the realm of search engines like Google, a canonical URL acts as the "preferred" version of a webpage among multiple versions with similar content. This helps search engines avoid confusion and ensure proper indexing and ranking.

Here's a breakdown of the key points

Why are Canonical URLs important?

Prevent duplicate content issues: Websites often have pages with almost identical content due to factors like dynamic URLs, printer-friendly versions, or slight variations targeted at different audiences. Canonical URLs tell search engines which version is the "master" copy, consolidating link equity and ranking power to that single page.
Improved SEO: By avoiding duplicate content issues, canonical URLs help websites rank higher in search results for relevant keywords.
Better user experience: When users land on the designated canonical page, they access the full content and functionality, avoiding confusion or frustration from encountering near-identical duplicates.

How do canonical URLs work?

There are two main ways to designate a canonical URL

Rel=canonical link element: This HTML code inserted into the head section of a page explicitly specifies the canonical URL.
HTTP Link header: This server-side method uses an HTTP header to convey the canonical URL directly to search engines.

Search engines may also determine the canonical URL based on various factors like content similarity, internal linking structure, and presence of canonical tags, even if not explicitly defined.

Things to remember:

Choose the most representative and complete version: The canonical URL should be the one you want search engines to index and rank for relevant searches.

Consistency is key: Use the same canonical URL consistently across all duplicate pages.

Self-referencing canonicals: It's recommended to include a self-referencing canonical tag on each page, even if it's the only version.

Canonical URLs don't block indexing: While designating a canonical URL influences ranking, it doesn't prevent other versions from being indexed. However, they might not rank as high.