Knowledge Graphs: What They Are, Where They Live, and How to Build One
Knowledge graphs quietly power a surprising amount of the tech you touch every day — search results, recommendations, fraud alerts, and increasingly the AI assistants we talk to. Yet the core idea is refreshingly simple. Let’s walk through it end to end: what a knowledge graph is, where you store one, where they’re useful, their trade-offs, and finally a small one you can build yourself in Python.
What is a knowledge graph?
A knowledge graph is a way of representing information as a network of entities (the things) connected by relationships (how they relate).
That’s it. Instead of cramming facts into rows and columns, you store them as connections. The unit of knowledge is a triple — a subject, a relationship, and an object:
- Catlin → lives in → NewYork
- Luna → is a → Cat
In graph terms, the entities are nodes (the dots) and the relationships are edges...
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