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

# Semantic Layer

- [What the Semantic Layer is?](https://docs.toucanai.cloud/build/semantic-layer/what-the-semantic-layer-is.md)
- [Metrics, dimensions and relationships](https://docs.toucanai.cloud/build/semantic-layer/metrics-dimensions-and-relationships.md)
- [Why does metadata matter?](https://docs.toucanai.cloud/build/semantic-layer/why-does-metadata-matter.md)
- [How-to](https://docs.toucanai.cloud/build/semantic-layer/how-to.md)
- [Complete metadata information](https://docs.toucanai.cloud/build/semantic-layer/how-to/complete-metadata-information.md)