In this video I build a real-time full stack chat app using the MERN stack (MongoDB, Express, React, Node.js) and Socket.IO. The main goal is simple: when you send a message to another user, they should receive it instantly without reloading the app. I also use Socket.IO to update online/offline status when a user logs in or logs out, so you can see the green dot and “online” label in the users list. I start by showing you the complete demo: signup/login, selecting a user to open the chat box, sending text messages and images, seeing unseen message counts, searching users, and checking the right-side profile panel where media (images sent in the chat) is listed. Then I set up the React client using Vite, add React Router DOM for pages (Home, Login, Profile), and style everything with Tailwind CSS plus the Outfit Google font. Finally, after building the app, I deploy it online for free using Vercel so you can share a live link. If you complete this project, I recommend adding the live link to your resume or using it as a solid college project.