'Express' is a streamlined and adaptable framework for Node.js, equipped with a comprehensive set of tools for crafting web and mobile applications. It accelerates the development process for applications built on Node.js.

Express is celebrated for its straightforwardness, scalability, and efficiency, making it a go-to framework for developing APIs and backend services in conjunction with Node.js. It enables the creation of potent server-side applications, adhering to the model-view-controller (MVC) architectural pattern.

As a key component of the MEAN (MongoDB, Express.js, Angular.js, Node.js) stack, Express has gained popularity in the development of dynamic web platforms and applications.