sameAs
A structured data property linking a declared entity to its verified profiles elsewhere on the web.
What it means
Wikipedia, Wikidata, LinkedIn, Crunchbase, an official register, verified social accounts. Each one is a corroborating reference that this name refers to this specific thing.
It is what turns a name into something resolvable instead of a string that happens to appear on a page.
The part a short definition leaves out
Quality beats quantity, and listing profiles you do not control or that do not clearly refer to the same entity weakens the signal rather than strengthening it.
Where this comes from
See whether this is costing you anything
The inspection reports on this signal directly, alongside thirty-seven others, and tells you whether it is a quick fix on your site or something deeper.