MEAN stack lets you create real-time websites with push capability and give developers a tool for working in the non-blocking, event-driven I/O paradigm. Node.js shines in real-time web applications by employing push technology over web sockets. Before MEAN came in, the web was living in a stateless request-response paradigm. MEAN stack brought us real-time web applications with two-way connections, where both the client and server can initiate communication, allowing them to exchange data freely. This paradigm is quite revolutionary considering traditionally only client used to initiate communication. As a result, MEAN forms the technology stack of various big enterprises.