Babelify is a transform for Browserify that allows you to use ES6/ES2015+ syntax in your browser-side JavaScript. It leverages Babel, a powerful JavaScript compiler, to transpile modern JavaScript code into a browser-compatible version. Effectively, it bridges the gap between cutting-edge JavaScript features and older browsers, making it an essential tool for modern web development workflows using Browserify to bundle dependencies. Babelify streamlines the process of writing and deploying future-proof JavaScript.