Yargs is a command-line argument parser that helps you build interactive command-line tools. It automatically generates an elegant help interface and parses arguments with ease, handling both options and commands. Developers can define required and optional arguments, specify argument types, and set default values. Yargs simplifies the process of crafting user-friendly and robust CLI applications with minimal boilerplate code. It's a go-to choice for building command-line interfaces in Node.js.