Canonical URL
The single preferred version of a page when multiple URLs serve identical or near-identical content.
In long form.
Canonical tags (`<link rel="canonical" href="...">`) tell search engines which version of duplicate or near-duplicate content to treat as the authoritative URL. Common scenarios: HTTP vs HTTPS, www vs non-www, trailing-slash vs no-slash, query parameters that don't change content, paginated archive pages, syndicated content, and faceted navigation on e-commerce sites. Self-referencing canonicals on every page is best practice.
Every page on the rebuilt nessimworks.com declares its own canonical via Next.js metadata.alternates.canonical — the cleanest pattern. We set it once per route and forget about it.
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