

NVM, short for Node Version Manager, is a command line tool for managing and switching to different versions of Node.js. This is why you should have NVM installed.

In addition, if you are making an NPM package, you might need to test it with different versions of Node.js. NPM is a tool for managing packages installed from the NPM registry.

Different software development tools might require specific versions of Node.js and NPM (Node Package Manager).
