This is a repackaged open source software product wherein additional charges apply for support. Webpack is a powerful and flexible open-source JavaScript module bundler and build tool primarily used for developing and optimizing web applications. It allows developers to bundle JavaScript files along with other assets like CSS, HTML, and images, transforming them into a single or multiple output files. Webpack configuration is highly customizable through a configuration file, enabling developers to define how different modules are handled and how the final output is generated. Its rich ecosystem includes plugins and loaders that extend its functionality, making it suitable for a wide range of tasks, from simple static websites to complex single-page applications (SPAs).