Express.js, or simply Express, is a back end web application framework for Node.js, released as free and open-source software under the MIT License. It is designed for building web applications and APIs. It has been called the de facto standard server framework for Node.js.
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CSS is the acronym for Cascade Styling Sheets. In short, it is a sheet style language, which is a type of language you can use to describe the presentation of a markup language – in this case, to describe the movements of HTML.