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Express.js is a web application framework for Node.js that provides a set of features for building single-page, multi-page, and hybrid web applications. The framework has become the standard server framework for Node.js. Express simplifies the development process by abstracting away much of the complexity while still allowing access to its powerful features when needed. This makes it possible to develop web applications more rapidly and with less code compared to native Node development methods. It also offers middleware that can be combined easily into an HTTP pipeline to handle requests and responses as they pass through the application. Expressjs follows an unopinionated philosophy, meaning developers have more freedom in defining their project's structure leading to greater flexibility but increased responsibility in terms of best practices implementation.