The process module is an Node.js core library for managing processes that is always implicitly loaded in a Node.js application because the application is itself a process. This global process contains many useful properties and methods, such as process.env for accessing environment variables, process.argv for accessing process arguments for the Node application, and process.exit() for closing the current Node.js application process.
There are many more useful things you can do with the process module; you can learn more about its capabilities in the following official Node.js documentation: