How to Design a Real time Chat Application? Real-time chat applications like WhatsApp, Telegram, and Slack have transformed how we communicate. They enable instant messaging across devices and locations. These messaging platforms must handle millions of concurrent connections, deliver messages with minimal latency, and provide features like message synchronization, notifications, and media sharing. In this section, we'll design a scalable real-time chat application that delivers messages instantly while maintaining reliability and consistency. Problem Statement Design a real-time chat application that: - Supports one-on-one and group messaging - Delivers messages instantly with minimal latency - Synchronizes messages across multiple devices - Supports media sharing (images, videos, files) - Provides message status indicators (sent, delivered, read) - Scales to millions of concurrent users - Works reliably even with intermittent connectivity This is a