Webpack Bundler is a JavaScript module designed to bundle files for use in a browser and generate an optimized distribution of a project tailored to its infrastructure (build). Rather than loading various scripts via separate requests, Webpack improves performance by offering features such as code splitting, which allows for dynamically dividing code; lazy loading for deferred loading of elements; and tree shaking to eliminate unused code, among others.

Using Webpack, a single JavaScript file and a single stylesheet are generated, simplifying the process. This tool is widely used in environments using frameworks such as Angular, Symfony, Gatsby, Nuxt, or NextJS. Furthermore, Webpack allows for the creation of optimized applications, whether single-page or multi-page, using vanilla JavaScript, without necessarily relying on a specific framework.

In summary, the Webpack glossary defines this tool as an essential JavaScript bundler for grouping files, optimizing performance and simplifying web application development, thus providing an efficient solution for dependency management and the creation of well-structured distributions.