Learn how to set up the backend for a poll web application using Express.js and GraphQL in this comprehensive tutorial video. Explore the process of creating a robust backend infrastructure, including setting up options, subscriptions, mutations, and input types for polls. Dive into creating models, establishing relationships, and updating the database. Gain insights into implementing password-based login functionality and learn effective testing techniques. Follow along as the instructor demonstrates the integration of JoinMonster to enhance database queries. By the end of this 1-hour and 18-minute tutorial, you'll have a solid understanding of building a scalable backend for a poll application using modern web technologies.