What is npm and what is it used for?
npm is the package manager and registry of the JavaScript ecosystem: developers use it to install, publish and update libraries from a command-line tool.
npm has two parts. The CLI installs the dependencies listed in each project's package.json file and publishes new packages. The registry, at npmjs.com, stores the packages and their versions. Packages can be public or private and can have a scope, such as @company/package, which groups the code of a user or an organization.
Organizations give several members permissions over the same packages. The audit command looks for known vulnerabilities in the installed dependencies, and publishing supports two-factor authentication (2FA) and provenance, which records which repository and pipeline a package came from.
Who uses it: JavaScript and Node.js projects, from websites to back ends, and companies that publish their own libraries. Installing and publishing public packages is free.






