MEAN is a boilerplate that provides a nice starting point for MongoDB, Node.js, Express, and AngularJS based applications. It is designed to give you a quick and organized way to start developing MEAN based web apps with useful modules like Mongoose and Passport pre-bundled and configured. MEAN mainly try to take care of the connection points between existing popular frameworks and solve common integration problems.
The framework allows for a rapid set up and deployment of web apps, websites, web services and APIs. MEAN is powering a growing number of websites and web apps, from blogs through media sites to data-rich app.
MongoDB is the leading NoSQL database, empowering businesses to be more agile and scalable.
Express is a minimal and flexible node.js web application framework, providing a robust set of features for building single and multi-page, and hybrid web applications.
AngularJS lets you extend HTML vocabulary for your application. The resulting environment is extraordinarily expressive, readable, and quick to develop.