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MERN is a free and open-source JavaScript software for building dynamic web applications. The things that we can do on the web nowadays with JavaScript running on the server, as well as in the web browser are vast. MERN is an acronym for mongodb, express.js, react.js, and node.js. mongodb is a database system; express is a back-end web framework; react.js is a front-end framework; and node.js is a back-end run-time environment