Webpack is a powerful static module bundler for modern JavaScript applications that processes your project's files by building a dependency graph. Starting from one or more entry points, it recursively maps out all the modules and assets your application needs, then intelligently combines them into a small number of optimized output files, or "bundles," for a browser to consume. This process significantly reduces the number of HTTP requests and improves application load time. Through a configurable system of "loaders" and "plugins," Webpack can also transform non-JavaScript assets like CSS or images into usable modules and perform a wide range of optimizations, such as code minification and transpilation, allowing developers to write modular code while delivering a highly performant final product.