babel-plugin-transform-es2015-modules-umd enables the transformation of ES2015 modules into the UMD (Universal Module Definition) format using Babel. This plugin allows your ES2015 modules to be used in various environments, including browsers, Node.js, and AMD loaders, by creating a single module that works across different module systems. Integrating it into your Babel configuration allows you to simplify module compatibility, facilitating broader usage of your JavaScript code.