> ## Documentation Index
> Fetch the complete documentation index at: https://oxy.tech/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Data Infrastructure

> The engines that get your data in and shape it — Airhouse, Airlayer, and Airform

Data Infrastructure is the foundation of Oxygen: it gets your data in, shapes it,
and compiles it into the queries your [World Model](/docs/guide/build/world-model) and
agents run. Three engines do the work, each open where it makes sense to be.

<CardGroup cols={3}>
  <Card title="Airhouse" icon="warehouse" href="/docs/guide/build/data-infrastructure/airhouse">
    The managed warehouse and connector. Workspaces mint short-lived,
    ephemeral credentials from a service account — there's no long-lived key to
    rotate.
  </Card>

  <Card title="Airlayer" icon="layer-group" href="/docs/guide/build/data-infrastructure/airlayer">
    The **core of the World Model** — an in-process semantic engine that compiles
    YAML schemas into dialect-specific SQL. Open source.
  </Card>

  <Card title="Airform" icon="diagram-project" href="/docs/guide/build/data-infrastructure/airform">
    dbt-style modeling — version-controlled SQL transforms that land clean,
    tested tables for the semantic model to build on. Open source.
  </Card>
</CardGroup>

## How they fit together

<Steps>
  <Step title="Land">
    Data arrives in **[Airhouse](/docs/guide/build/data-infrastructure/airhouse)** (or
    your own warehouse).
  </Step>

  <Step title="Shape">
    **[Airform](/docs/guide/build/data-infrastructure/airform)** models raw tables into
    clean, tested ones.
  </Step>

  <Step title="Compile">
    **[Airlayer](/docs/guide/build/data-infrastructure/airlayer)** compiles your
    semantic definitions over those tables into correct SQL — the foundation the
    [World Model](/docs/guide/build/world-model) reasons over.
  </Step>
</Steps>