Mobile app development in Chennai involves several key phases: planning, design, development, testing, and deployment. During the planning phase, requirements are gathered from clients. In the design phase, user interfaces and experiences are created. Development involves coding the app for the intended platforms, whether iOS or Android. A rigorous testing phase follows to identify and fix bugs, ensuring functionality and usability. Finally, the app is deployed to app stores, where it becomes available for users. Post-launch support and updates are also integral to the process to enhance performance and user experience.