NPM is a package manager for node.js Package, or module if you like.
Www.npmjs.com hosts thousands of free packages, to download and use.
The NPM program is Installed On your computer when you install node.js
What is a package?
A package in node.js contains all the files you need for a module.
Modules are Javascript libraries you can include in your project.
Using a package:
Once the package is installed, it is ready to use.
Include the "upper case" package the same way you include any other module.
Var uc=require('upper case');
