node-build is a command-line utility that makes it easy to install virtually any version of Node, from source or precompiled binary. It is available as a plugin for nodenv that provides the nodenv install command, or as a standalone program.

What is npm build?

npm build is an internal command and is called by link and install commands, according to the documentation for build: This is the plumbing command called by npm link and npm install. You will not be calling npm build normally as it is used internally to build native C/C++ Node addons using node-gyp.

Is node and Nodejs same?

node and nodejs have identical functionality but they are different versions because they are two different packages in Ubuntu Software. nodejs is the older version apt package and node is the more up-to-date snap package.