The MEAN stack, which includes MongoDB, ExpressJS, AngularJS, and Node.js, offers several advantages, including using a uniform language throughout the stack, performance gains, and ease of debugging and database administration. By coding with JavaScript throughout, developers can realize performance gains in both the software itself and in the productivity of their developers. Additionally, MongoDB's JSON-like format allows for seamless interaction between the server-side code, database queries, and client-side code, making it easier to understand and maintain the codebase. The use of MongooseJS provides an easy-to-use schema and usability tool for Node.js, allowing developers to define schemas in JSON and create models that provide access to MongoDB collections. Overall, the MEAN stack offers a powerful and flexible solution for building web applications, particularly those that require real-time data processing and scalability.