NPM is the primary package manager for the JavaScript programming language. It acts as both the registry and also provides command-line tooling. It is considered the world's largest software registry.
NPM serves both front-end code — JavaScript packages meant to be run in the browser – and back-end code — Node.js libraries.
While there appear to be alternatives to NPM, like Yarn, they typically are only providing the command-line tooling, but actually use NPM as the registry, or the source of the packages.
You can learn more about NPM on its website.
Keep Reading
WTF is a Package Manager?
A brief description of package managers, with some examples using referencing JavaScript packages.
WTF is JavaScript?
A brief description of JavaScript, with a few links to dig in and learn more.
WTF is Node.js?
An brief introduction to Node.js, along with links to dig in further with a tutorial or course.