# Entity (SEO)

> Source: https://rankxai.com/glossary/entity-seo · Last updated: 2026-08-18

An entity is a distinct thing a search system has identified and can reason about: a company, a person, a product, a place. An entity is not a keyword. A keyword is a string that can be matched; an entity is a subject that can be described, connected and confused with another.

## Why does the string-to-entity distinction matter now?

Because an assistant answers about subjects rather than about phrases. When somebody asks which tools do a job, the system is assembling a set of things it believes exist and can describe, and a brand it has not resolved into one of those things cannot be in the set however many pages it has.

This is where naming inconsistency stops being a style question. “RankX AI”, “RankXAI” and “Rank XAI” are three strings, and a system with no reason to merge them has three weakly described entities instead of one well described entity. The cost is invisible: nothing errors, the brand simply appears less often than the sum of its mentions should support.

## How is an entity actually established?

Consistent description across sources the system already trusts, which is mostly not your own site. `Organization` markup with `sameAs` pointing at the profiles you control is the plumbing, and it works by connecting things that already exist rather than by asserting anything new. Wikipedia and Wikidata presence carries disproportionate weight because both are heavily represented in training data, and neither is something you can write yourself.

The correlation data agrees with the theory here, which is not always the case. In Ahrefs’ study of 75,000 brands, branded web mentions correlated with AI visibility at 0.664 and backlinks at 0.218, which is what you would expect if the mechanism is “this thing is described consistently in many places” rather than “this domain has authority”.

## What is the cheapest entity work most companies skip?

Deciding the canonical name and then enforcing it everywhere: the site, the schema, every third-party listing, the social profiles, the press release boilerplate. It takes an afternoon, it never needs doing again, and it is the only entity work with no dependency on anybody else’s editorial decision.

The recommendation, which could be wrong for a company mid-rebrand: pick the form you will still be using in five years rather than the one that reads best today, because every mention published under the old form keeps working against the merge. Include the legal name somewhere too, once, on a page that states it plainly. It is the string that connects you to registers, filings and databases nobody at your company maintains, and it is the cheapest corroboration available. A company number, where you have one, is better still: it is the single claim on a marketing site that a reader can check against a public register.

## Sources

- [Ahrefs: what correlates with AI Overview brand visibility, 75,000 brands, 26 May 2025](https://ahrefs.com/blog/ai-overview-brand-correlation/), checked 2026-08-18
- [Google Search Central: Organization structured data](https://developers.google.com/search/docs/appearance/structured-data/organization), checked 2026-08-18