The **html-webpack-externals-plugin** is a Webpack plugin designed to work with **html-webpack-plugin**, allowing developers to use pre-packaged vendor bundles in their applications. It modifies the Webpack configuration to exclude specified vendor modules from the bundle, copies their assets to the output directory, and injects the necessary script or link tags into the HTML output. This plugin is particularly useful for optimizing build performance by leveraging external dependencies, such as CDN-hosted libraries or locally installed vendor modules.