Deploying a web application using Gunicorn is a crucial step in ensuring that your Flask app runs efficiently in a production environment. Gunicorn, a Python WSGI HTTP server, is designed to serve Python web applications, providing a robust and scalable solution. It allows you to manage multiple worker processes, enabling your application to handle concurrent requests effectively. When combined with a web server like Nginx, Gunicorn can efficiently serve static files and manage incoming traffic, enhancing performance and reliability. Understanding how to configure and deploy your Flask app with Gunicorn is essential for any developer looking to launch their application successfully.