# Cosmos SDK Core The [cosmossdk.io/core](https://pkg.go.dev/cosmossdk.io/core) go module defines "core" functionality for the Cosmos SDK. Currently functionality for registering modules using the [appmodule](https://pkg.go.dev/cosmossdk.io/core/appmodule) package and composing apps using the [appconfig](https://pkg.go.dev/cosmossdk.io/core/appconfig) package is provided. In the future core functionality for building Cosmos SDK app modules will be provided in this go module.