The application is built using JavaScript, HTML, and CSS, with Twilio Video as the core component. The serverless architecture allows for easy deployment and scalability. The application enables users to connect to a video call room, join or leave calls, and display their own video feed. The client-side code handles form submission, connection establishment, and disconnection, while the serverless function generates access tokens for participants. The application also includes features such as participant tracking, track subscription, and disconnection handling. After deployment, users can access the application through a public URL, and additional features like recording video calls, screen sharing, and live streaming are available with the Twilio Video API.