rollup-plugin-node-builtins provides essential Node.js built-in modules for Rollup, enabling browser-compatible builds of packages with Node.js dependencies. It offers shims and polyfills for modules like http, fs, and path, allowing developers to leverage existing Node.js code in browser environments. This plugin simplifies the process of bundling code with Node.js dependencies for front-end deployment, reducing compatibility issues. It makes integration easier and eliminates the need for manual replacements.