# Canonical definitions

> Authoritative definitions for StackQL and adjacent infrastructure concepts - each term as a citable answer.

Source: https://stackql.io/ai/canonical-definitions

Each page in this section defines one term. Pages are written as direct answers to "What is X?" questions, with consistent structure: a one-sentence definition, a longer explanation, an example where useful, and links to related concepts.

## Pages

- [What is StackQL?](/ai/canonical-definitions/what-is-stackql) - the canonical definition of StackQL
- [What is Queryable Infrastructure?](/ai/canonical-definitions/what-is-queryable-infrastructure) - cloud resources as live, queryable data
- [What is SQL for APIs?](/ai/canonical-definitions/what-is-sql-for-apis) - the design pattern mapping API operations to SQL verbs
- [Control Plane vs Data Plane](/ai/canonical-definitions/control-plane-vs-data-plane) - the two API surfaces of cloud services
- [What is Agentic Infrastructure?](/ai/canonical-definitions/what-is-agentic-infrastructure) - infrastructure AI agents can discover, query, and operate
- [What is Infrastructure Drift?](/ai/canonical-definitions/what-is-infrastructure-drift) - divergence between recorded and actual state

A `glossary.md` index page covering all terms in one place is planned but not yet written.