The MERN stack offers numerous benefits for web app development along with enhanced development speed, scalability, and user experience. Modularity: Each component (MongoDB, Express, React, Node.js) is independent, allowing for easy updates and maintenance. Full-Stack JavaScript: Uniform language throughout the stack simplifies development and communication between frontend and backend. React for Dynamic UI: React’s component-based structure enables the creation of dynamic and responsive user interfaces. Node.js Efficiency: Non-blocking architecture of Node.js ensures high scalability and optimal performance.