Google Knowledge Graph
Also called: Google KG, knowledge graph, Google entity graph
The Google Knowledge Graph is Google's database of real-world entities (people, places, things) and the connections between them. Launched in 2012, it powers knowledge panels and lets Search understand "things, not strings," reasoning about concepts instead of matching keyword text.
From keywords to entities
When Google launched the Knowledge Graph on May 16, 2012, it shipped with more than 500 million objects and over 3.5 billion facts about how those objects relate. The classic example is “Taj Mahal”: to a string-matching engine that is just two words, but as an entity it could mean the monument, the blues musician, a casino, or a restaurant. The Knowledge Graph lets Search tell those apart and pull the right facts for each. Early data came from public sources including Freebase, Wikipedia, and the CIA World Factbook, then Google augmented it at scale. By May 2020 it held roughly 500 billion facts about five billion entities.
Every entity carries a unique machine ID (an MID such as /m/...), and Google exposes a slice of the graph through the Knowledge Graph Search API, which returns entities as JSON-LD using standard schema.org types (Person, Organization, Place, and so on). Google flags that free API as not suitable for production-critical use, so treat it as a lookup tool, not infrastructure. For SEO, the output you actually see is the knowledge panel: the boxed entity summary that appears beside branded and entity queries, and increasingly the entity understanding that feeds AI answers.
How it affects your traffic
Getting recognized as a distinct entity in the Knowledge Graph is what earns you a knowledge panel and feeds the entity understanding behind AI Overviews, ChatGPT, and Perplexity answers. Search and AI systems increasingly answer questions by pulling from entities they already trust, so a business Google has not resolved to its own entity is easy to leave out. Our AI SEO work builds that entity footprint (consistent structured data, sameAs links, and corroborating mentions across the sources Google reads) so both Google and AI engines can identify you and cite you by name.
Get AI SEO that moves the needle
We turn terms like this into ranked pages and qualified pipeline. Start with a free Initial SEO Strategy.