MEAN is a combination of MongoDB, Express.js, and Angular.js, all of which run upon Node.js.
MEAN intends to take care of the connection points between existing popular frameworks and simplify the approach to address common integration problems.
MEAN Stands for:
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.