NPM, or Node Package Manager, is a package manager for JavaScript and the world’s largest software registry. It is the default package manager for the JavaScript runtime environment Node.js. It consists of a command line client, also called npm, and an online database of public and paid-for private packages, called the npm registry. With npm, developers can easily install, manage, and update packages from the registry and use them in projects. NPM helps developers find, share, and reuse code, as well as easily update their own projects. It also helps developers manage dependencies, making sure that all the packages needed for a project are up to date and work together. NPM is the most popular package manager for JavaScript and is used by millions of developers around the world.
Cloudsmith provides full support for npm (and npmjs), but as a full package management SaaS alternative. It has support for package formats beyond npm alone (such as Python/Ruby), and offers a full set of features that would be interesting for multilingual users, organizations and environments.
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npm is for javascript and rubygems is a package manager for ruby.