nRF Util's toolchain-manager is a CLI tool for managing and using toolchains for the nRF Connect SDK.
Each version of nRF Connect SDK has an associated toolchain, which includes tools and modules specific to the nRF Connect SDK that are required to build nRF Connect SDK samples and applications. Multiple SDK versions can share the same toolchain version.
Installing the nRF Connect SDK toolchain is a key part of the SDK installation process.
Note: The toolchain-manager command is being gradually replaced by the sdk-manager command. See the sdk-manager command to learn about its features and start using it.