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Webpack is a bundler for modules. The main purpose is to bundle javascript files for usage in a browser, yet it is also capable of transforming, bundling, or packaging just about any resource or asset.
Bundles both CommonJs and AMD modules (even combined).
Can create a single bundle or multiple chunks that are asynchronously loaded at runtime (to reduce initial loading time).
Dependencies are resolved during compilation reducing the runtime size.
Loaders can preprocess files while compiling, e.g. coffeescript to javascript, handlebars strings to compiled functions, images to Base64, etc.
Highly modular plugin system to do whatever else your application requires.