Nopt is a command-line option parser for Node.js. It simplifies the process of defining and parsing command-line arguments, allowing developers to easily handle options, flags, and values passed to their Node.js scripts. Nopt provides a flexible and concise way to specify expected arguments and their types, automatically converting the input into a structured object for easy access within the application logic. Handling complex command-line interfaces becomes more manageable with nopt's intuitive API.