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Illustration: A giant glowing magnifying glass hovers over an isometric archive built as eight stacked floors, one color per floor.

The AI stack, explained. Plain-English encyclopedia entries on every layer of building with AI, from tokens and transformers to agents, evals, and safety - kept current so you can trust what you read.

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The stack

Core Concepts
Models & Providers
Retrieval & Data
Agents & Orchestration
Inference & Serving
Evals & Observability
AI Coding
Safety & Governance

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