> For the complete documentation index, see [llms.txt](https://docs.quanti.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.quanti.io/key-concepts/concepts/semantic-layer.md).

# Semantic Layer

The **Semantic Layer** is QUANTI:'s data modeling layer. It lets you define business metrics, KPIs, and dimensions on top of your raw data, creating a shared and consistent vocabulary across your organization.

Instead of writing the same SQL logic in every report, you define it once in the Semantic Layer and reuse it everywhere. This ensures that "Revenue" or "Active Users" always means the same thing, regardless of who is querying the data.

The Semantic Layer builder is included in all QUANTI: plans.


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