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

# Module catalog

> The Ravion module catalog hosts reusable infrastructure modules, with definitions, versions, and instances that teams provision on demand.

The catalog holds module **definitions**. Each definition has **versions**, and a version is instantiated as a module **instance** in an environment.

By default, your catalog includes the [Ravion standard library](/module-definitions/standard-library) of production-ready modules.

You can add your own module definitions to the catalog. Your modules are only accessible by your organization.