os-browserify is a shim for the Node.js os module, designed specifically for browser environments. It allows code written for Node.js that relies on OS-specific functionalities (like getting hostname or EOL) to be used in the browser without modification by providing browser-compatible implementations. This package is essential when you want to bundle Node.js code with tools like Browserify, Webpack or Parcel, bridging the gap between server-side and client-side JavaScript.