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npm (short for Node Package Manager) is the default package manager for the JavaScript runtime environment Node.js. It is a command-line tool that is used to install and manage packages, or collections of code, that are made available through the npm registry. The npm registry is a public repository of open-source Node.js packages that are available for use in other projects. It contains over 1.3 million packages, making it the largest software registry in the world. Developers can use npm to search for, download, and install these packages, as well as share their own packages with the community.