MERN stack is a collection of technologies used in website building and mobile app development.
MongoDB, React.js, Node.js, and Express are all JavaScript-based and open-source components that provide an end-to-end framework for web development. In a nutshell, ExpressJs is a back-end web framework, React is a front-end framework, Node JS is a back-end runtime environment, and MongoDB is a database system.
While the majority of web app developers use the most common approaches like HTML and JavaScript to design mobile apps. These approaches have since become obsolete, and new ways have emerged.
MERN Web & Software Development is a brand-new stack that most developers are using to create a rich-feature-loaded capable app.