NVM (Node Version Manager) is a tool used to download, install, manage, and upgrade Node.js versions. It allows the user to maintain multiple versions of Node.js on their system and change the active version depending on their current needs.
NPM (Node Package Manager) is the default Node.js package management tool that comes as a part of the Node.js installation on Windows, macOS, Ubuntu, Debian, CentOS, and other supported systems. With the npm command-line utility, the user can install JavaScript packages from the npm registry, an online database of public and private packages.