Ensures the domain consistently resolves to one version (WWW or non-WWW).
This check ensures your website is only accessible at one primary domain, either `www.yourdomain.com` or `yourdomain.com`, but not both. The other version should permanently redirect (301) to the primary one.
Search engines see `www.domain.com` and `domain.com` as two separate websites. If both are active, it creates duplicate content, splitting your SEO authority and confusing search engines.
This is a critical issue. Duplicate content dilutes your ranking signals and can lead to lower rankings for both versions of your site.
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