# Component Catalogs

This section is the "dictionary" for Harmony. It lists all the reusable components available out-of-the-box.

- [**Scores Catalog**](./scores.md): Discover all available `Scores` (the "what").
- [**Topologies Catalog**](./topologies.md): A list of all available `Topologies` (the "where").
- [**Capabilities Catalog**](./capabilities.md): A list of all available `Capabilities` (the "how").